Maize big spot disease and corn leaf spot mainly damage the leaves and sometimes invade the leaf sheath and temporal lobe. In addition to damaging these sites, small spot disease can also harm the ear. These two diseases are often collectively referred to as "corn spot." The typical symptoms of corn spot disease are rapid expansion from small lesions to large rhomboids, up to 10 to 30 centimeters in length. Some of the speckles even exceed 30 centimeters. Sometimes several lesions are connected together to form irregularities. Big spot. The lesions were initially immersed in water and quickly turned blue-gray, eventually turning brown with dead spots. When the air is wet, black molds can grow on the lesions. Symptoms of corn leaf spot are characterized by small lesions, generally no more than 1 cm in length, and limited to only two veins, nearly elliptical, with a darker, darker rim. In addition, the number of lesions is generally more. The pathogens of large and small spotted corn were overwintering on contaminated spores. Or the mycelium lurks in the diseased tissue for wintering, and the second year of spore germination causes the initial infection. The infected plant produces a large number of conidia, causing re-infection. Prevention and control points: At the beginning of the disease, 50% of the bacteriocins are used for 2000-3000 times + Tianda 2116 grain type 600 times + Tianda Yufeng 1500-2000 times liquid spray, sprayed 2 or 3 times, and sprayed every 10 to 15 days. once. Or use 50% Tianda procymidone 50 ~ 100g spray at the end of the heart to silking period 1 to 2 times.
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