(I) Control of cyst nematodes
1. Strengthening quarantine and protecting disease-free areas: It is forbidden to transfer soybean seeds from the wards.
2. Agricultural control: Soybeans and non-host plants such as grass crops or cotton should be used for rotation, and the conditions for the best implementation of water and dry wheels are the most important and effective measures for preventing and controlling this disease. The period of rotation can not be less than 3 years, more than 5 years to prevent disease.
3. Chemical control. Pharmacy: DD mixture. 30-50 kilograms of medication per mu, ditch applied 20 cm deep, applied after ridging suppression, 15-20 days after sowing.
(B) Prevention of Downy Mildew
1. Breeding and promotion of disease-resistant varieties. The disease-resistant varieties were: Zaofeng No. 5, Baihuayu, Jiunong 9 and No. 2, Fengshou No. 2, Ji 76-5187, Ji 78-5053, Ji 79-5354, and Mildew 1.
2. Chemical control. The effective medicines include: 65% dexamethasone wettable powder 500 times; 25% trehalose mold wettable powder 500-800 times; 50% bacteriostatic wettable powder 800 times; 75% chlorothalonil wettable Powder 700-800 times liquid. The amount of liquid used per mu is about 60 kg.
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