1. Select disease-resistant varieties according to local conditions; 2. Rationally apply fertilizers, apply organic base fertilizers in combination with site preparation, do not apply excessive amounts of available nitrogen fertilizers, and appropriately increase phosphorus and potassium fertilizers; 3. Strengthen field management, timely ramification, diligent weed removal, and improvement Field ventilation and lightening and light transmission conditions; 4. The following agents can be used at the early stage of disease: (1) 15% triadimefon 1500~2000 times fluid; (2) 25% enemy dewetting oil 3000x fluid; (3) 70% Mancozegan Zn wettable powder 1000 times liquid plus 15% Triadimefon wet powder 3000 times liquid and so on. Spray once every 15~20 days, spray 2~3 times continuously.
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