Control of Soybean Diseases and Pests

I) Control of cyst nematodes

1. Strengthen quarantine and protect disease-free areas: it is forbidden to transfer soybean seeds from disease areas.

two。 Agricultural prevention and control: the implementation of soybean and Gramineae crops or cotton and other non-host plant rotation, if possible, it is best to implement water and drought rotation, which is the most important and effective measure to prevent and cure this disease. The number of years of rotation should not be less than 3 years, and disease prevention should be more than 5 years.

3. Chemical control. The potions are: Dmurd mixture. 30-50 kg per mu, 20 cm deep in the ditch, ridging and suppression after application, sowing 15-20 days later; 3% carbofuran granule, 5-6 kg per mu, mixed with fertilizer before sowing, but separated from the seeds. 15% aldicarb granules: 1.2-1.5 per mu, apply more than 10 cm in ditch when sowing, sow seeds after shallow covering, so that the seeds do not come into contact with pharmaceutical agents.

II) Prevention and control of downy mildew

1. Breeding and popularizing disease-resistant varieties. The resistant varieties are Zaofeng 5, Baihua file, Jiu Nong 9 and 2, Fengshou 2, Sui 76-5187, Sui 78-5053, Sui 79-5354 and Anti-mildew 1.

two。 Chemical control. The effective agents are: 500 times solution of 65% Deisen zinc wettable powder, 500-800 times liquid of 25% Ruidui wettable powder, 800 times liquid of 50% bacillate wettable powder, and 700-800 times liquid of 75% chlorothalonil wettable powder. The amount of liquid used per mu is about 60 kg.