Maize big spot disease mainly damages leaves, leaf sheaths and temporal lobe, and it is one of the major diseases in the middle and later stages of corn growth.
Symptoms: The diseased leaves first appear water-stained blue-gray spots, spreading along the veins to both ends, forming large spots with dark brown, central hazel or blue-gray edges. Late lesions often split or merged and the leaves withered. There is a lot of gray moldy layer on the lesion when wet. The lower leaves first develop the disease.
Prevention: Before and after corn tasseling, the disease rate in the field reached more than 70%. When the diseased leaf rate was 20%, spraying was started, spraying once every 7-10 days, total prevention and control 2-3 times.
Commonly used pharmaceuticals: carbendazim, diazepam, mancozebite, and potassium oxime.
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