Symptom identification: The main damage to the corn leaves, but also invade leaf sheath and temporal lobe. At the beginning of the disease, a round, oval red-brown rectangular stripe was formed between the veins. The lesions were mostly between the veins and parallel to the veins. When the lesions were mature, the lesions were gray in the center and brown in color. The size was (4 to 20) mm (2). 5) mm. When the humidity is high, gray molds appear on the back of the lesion. Most of the disease started from the lower leaves in the tasseling period. Low temperatures (20°C to 25°C), high rainfall, and relative atmospheric humidity of more than 90%, the occurrence of gray spot disease is serious and easy to cause epidemic, while high temperatures and droughts inhibit the disease epidemic.
Control methods: 1, selection of disease-resistant varieties: Zhongyu 335, Yayu 889, etc.; 2, to strengthen the cultivation and management: against the initial infection characteristics of corn gray spot pathogens, corn harvest, should be promptly deep-turned, reduce the wintering bacteria The number of sources. Apply enough basal fertilizer at the time of sowing to top-dress fertilizer in time to prevent later defertilization. Do a good job in crop rotation, intercropping and intercropping to improve the microclimate in the field and improve the resistance of plants; 3. Chemical control: At present, the prevention and treatment of corn gray spot disease is not yet in-depth research. Use 70% thiophanate-methyl wettable powder, 50% zearaconazole WP or 70% mancozeb. Spraying 2-3 times, every 7-10 days, can achieve a certain control effect.
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