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Second, the incidence conditions: (A) in the high temperature, high humidity conditions are more susceptible to disease. (2) The dew on the surface of corn leaves has a long duration, which is conducive to the invasion of pathogens and is also prone to disease. (3) The incidence of excessive dense planting, low waterlogging, continuous cropping is heavier.
Third, the prevention and control methods: (a) the rational close planting, increased organic fertilizer and phosphorus, potash fertilizer. (b) At the beginning of the disease, 50% carbendazim WP 500 times, 50% WP WP 800 to 1000 times, and 80% thiophanate-methyl 800 ～ 1000 times can be used for spraying control. With liquid medicine 60 to 75 kg.
Corn leaf spot and leaf spot hazard symptoms and control methods
First, the harm symptoms: corn leaf spot and blight in the corn leaves, leaf sheaths and temporal lobes occur, but the most serious damage to the leaves. (1) The lesions of large spot disease are large and small, and water-stained, gray-grey spots appear on the leaves at the onset of the disease, and then spread along the veins to form large-brown spots. When the weather is wet, there are dark brown moldy layers on both sides of the diseased leaf. (b) The lesions of small spot disease are numerous and small, with tens to hundreds of lesions on one leaf. Common lesions are oval, nearly oblong, and spindle-shaped.