In the late growth stage of corn, large spot and small spot disease often occur, and the condition of corn will gradually increase after heading. These fusiform lesions on the leaves are typical symptoms of large spot disease. The lesions are grayish green when they first appear, and black moldy layers appear above them when wet. Spot lesions are oval in shape, nearly round or oblong, and have watery spots on the leaves at the onset of the disease. When the big and small spot disease occurs seriously, the lesions on the leaves are connected into pieces, causing the leaves to die and the plants to die. Generally the lower leaves exhibit symptoms first and then expand upwards. Both types of germs originate from corn residues that have developed in the past year. To prevent and treat corn leaf spot disease, we must first plant resistant varieties. The second is that when the diseased plants in the field reached 70% before and after corn tasseling, spraying control was performed when the leaves reached 20%. 50% carbendazim WP can be used 500 times, 70% thiophanate-methyl wettable powder 1000-1200 times, and 75% chlorothalonil wettable powder 800 times. Interval 7 days, spray 2-3 times.
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