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	The surface of the leaves in this picture is densely covered with reddish brown spots, with a considerable number and uneven distribution. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	From the picture, it can be clearly seen that the surface of the leaves is covered with a large number of reddish brown spots, which are scattered on the leaves and present a dense state. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, numerous and unevenly distributed. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this photo, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the surface of the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with many reddish brown spots. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this picture, scattered on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is densely covered with reddish brown spots, concentrate on the leaves. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It can be clearly seen from the image that the surface of the leaves is covered with a large number of reddish brown spots scattered on the surface. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, a large number of reddish brown spots appear on the leaves, scattered throughout the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, densely distributed on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with dense spots, with a reddish brown color. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the surface of the leaves is covered with dense spots, with a reddish brown color and uneven distribution. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is covered with reddish brown spots, densely and unevenly distributed. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the leaves are covered with reddish brown spots, which are evenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The leaves are covered with reddish brown spots, densely packed and evenly distributed. This situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are large red brown blisters and scattered spots on the leaves. This abnormal situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image observation, the leaves are covered with reddish brown spots, unevenly distributed on the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	By observing the image, there are numerous reddish brown blisters densely distributed on the leaves. This abnormal situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The surface of the leaves in this picture is densely covered with reddish brown spots, with a considerable number and uneven distribution. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	From the picture, it can be clearly seen that the surface of the leaves is covered with a large number of reddish brown spots, which are scattered on the leaves and present a dense state. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, numerous and unevenly distributed. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this photo, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the surface of the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with many reddish brown spots. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this picture, scattered on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is densely covered with reddish brown spots, concentrate on the leaves. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It can be clearly seen from the image that the surface of the leaves is covered with a large number of reddish brown spots scattered on the surface. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, a large number of reddish brown spots appear on the leaves, scattered throughout the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, densely distributed on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with dense spots, with a reddish brown color. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the surface of the leaves is covered with dense spots, with a reddish brown color and uneven distribution. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is covered with reddish brown spots, densely and unevenly distributed. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the leaves are covered with reddish brown spots, which are evenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The leaves are covered with reddish brown spots, densely packed and evenly distributed. This situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are large red brown blisters and scattered spots on the leaves. This abnormal situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image observation, the leaves are covered with reddish brown spots, unevenly distributed on the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	By observing the image, there are numerous reddish brown blisters densely distributed on the leaves. This abnormal situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The surface of the leaves in this picture is densely covered with reddish brown spots, with a considerable number and uneven distribution. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	From the picture, it can be clearly seen that the surface of the leaves is covered with a large number of reddish brown spots, which are scattered on the leaves and present a dense state. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, numerous and unevenly distributed. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this photo, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the surface of the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with many reddish brown spots. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this picture, scattered on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is densely covered with reddish brown spots, concentrate on the leaves. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It can be clearly seen from the image that the surface of the leaves is covered with a large number of reddish brown spots scattered on the surface. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, a large number of reddish brown spots appear on the leaves, scattered throughout the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, densely distributed on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with dense spots, with a reddish brown color. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the surface of the leaves is covered with dense spots, with a reddish brown color and uneven distribution. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is covered with reddish brown spots, densely and unevenly distributed. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the leaves are covered with reddish brown spots, which are evenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The leaves are covered with reddish brown spots, densely packed and evenly distributed. This situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are large red brown blisters and scattered spots on the leaves. This abnormal situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image observation, the leaves are covered with reddish brown spots, unevenly distributed on the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	By observing the image, there are numerous reddish brown blisters densely distributed on the leaves. This abnormal situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The surface of the leaves in this picture is densely covered with reddish brown spots, with a considerable number and uneven distribution. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	From the picture, it can be clearly seen that the surface of the leaves is covered with a large number of reddish brown spots, which are scattered on the leaves and present a dense state. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, numerous and unevenly distributed. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this photo, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the surface of the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with many reddish brown spots. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this picture, scattered on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is densely covered with reddish brown spots, concentrate on the leaves. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It can be clearly seen from the image that the surface of the leaves is covered with a large number of reddish brown spots scattered on the surface. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, a large number of reddish brown spots appear on the leaves, scattered throughout the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, densely distributed on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with dense spots, with a reddish brown color. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the surface of the leaves is covered with dense spots, with a reddish brown color and uneven distribution. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is covered with reddish brown spots, densely and unevenly distributed. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the leaves are covered with reddish brown spots, which are evenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The leaves are covered with reddish brown spots, densely packed and evenly distributed. This situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are large red brown blisters and scattered spots on the leaves. This abnormal situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image observation, the leaves are covered with reddish brown spots, unevenly distributed on the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	By observing the image, there are numerous reddish brown blisters densely distributed on the leaves. This abnormal situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The surface of the leaves in this picture is densely covered with reddish brown spots, with a considerable number and uneven distribution. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	From the picture, it can be clearly seen that the surface of the leaves is covered with a large number of reddish brown spots, which are scattered on the leaves and present a dense state. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, numerous and unevenly distributed. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this photo, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are many reddish brown spots on the surface of the leaves, which are numerous and unevenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with many reddish brown spots. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	A large number of reddish brown spots were observed on the surface of the leaves in this picture, scattered on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is densely covered with reddish brown spots, concentrate on the leaves. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It can be clearly seen from the image that the surface of the leaves is covered with a large number of reddish brown spots scattered on the surface. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, a large number of reddish brown spots appear on the leaves, scattered throughout the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Many reddish brown spots were observed on the surface of the leaves in this picture, densely distributed on the leaves. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	It is evident from the image that the surface of the leaves is covered with dense spots, with a reddish brown color. These abnormal situations are likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the surface of the leaves is covered with dense spots, with a reddish brown color and uneven distribution. This abnormal phenomenon is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	Observing that the surface of the leaves in this picture is covered with reddish brown spots, densely and unevenly distributed. This abnormal phenomenon is caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, the leaves are covered with reddish brown spots, which are evenly distributed. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	The leaves are covered with reddish brown spots, densely packed and evenly distributed. This situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image, there are large red brown blisters and scattered spots on the leaves. This abnormal situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	According to the image observation, the leaves are covered with reddish brown spots, unevenly distributed on the leaves. This situation is likely caused by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.
	By observing the image, there are numerous reddish brown blisters densely distributed on the leaves. This abnormal situation is likely influenced by Corn rust. Corn rust mainly occurs on maize leaves and can also infect leaf sheaths, stems, and bracts. In the early stage of infection, small pale yellow white spots appear on both sides of the leaves, with yellow halos around them. Later, they protrude to form yellow brown or even reddish brown blister spots, which are scattered or clustered in circular or elongated shapes, forming the summer spore pile of the pathogen. After the surface of the spore pile ruptures, rust like summer spores scatter. In the later stage, black blisters appear near or near the lesion, which is the winter spore pile of the pathogen. It is oval shaped, and the blisters rupture and scatter black brown powder like substances. When the disease is severe, the entire leaf can be covered with rust brown spots, causing the leaves to wither and turn yellow.