Comprehensive Prevention and Control Techniques for Diseases and Pests of Chinese Cabbage
At present, the Chinese cabbage planting is about to begin. During the entire growth process of Chinese cabbage, the main insect pests are cabbage caterpillar, diamondback moth, and rapeseed meal; the diseases mainly include virus disease, downy mildew, soft rot, and white spot disease. In order to capture the bumper harvest of cabbage, the following comprehensive prevention and control technologies are proposed.
I. Selection of resistant varieties
High-yield, high-quality and disease-resistant varieties are the basis for the high yield and yield of Chinese cabbage. The currently resistant varieties that are better performing in our city are Jincai No. 3, No. 3, No. 4 of Fengcai, Fengkang 78, Taiyuan No. 2 Green, and Stone. Green 85, Qing Za 3, Beijing New 3 and so on. Seed disinfection before sowing can reduce the disease caused by seed bacteria.
Second, appropriate sowing, the implementation of half-high ridge live.
The sowing date of Chinese cabbage is generally suitable within three days before and after the beginning of autumn. During this period, early maturing varieties can be properly sown late, while late-maturing varieties can be appropriately sown early. The implementation of half-high ridge cultivation is conducive to irrigation and drainage, ventilation and light, lower ground temperature, can reduce the occurrence of diseases. According to the current practice, the ridges should be ridged at a height of 60 centimeters, ridged at 15-20 centimeters, and sown at 40-50 centimeters.
Third, chemical prevention
1. Diseases: The common diseases of Chinese cabbage in the city are mainly downy mildew, soft rot, black rot, black spot, and viral diseases. In terms of prevention and control, we should begin to use drugs at the beginning of the disease, every 7- Once a day for 10 days, it can prevent 2-3 times. 1 Downy mildew: Spray with 40% triethylaluminum phosphate WP 150-200 times or 64% WP wettable powder 500 times. 2 soft rot and black rot: 70% of agricultural Streptomyces 3000-4000 times or 4000 times of new plant mildew spray. 3 Black spot: Spray with 75% chlorothalonil or 70% mancozeb 500 times. 4 virus disease: to control the transmission of vector aphids, can use 10% imidacloprid 1500 times spray control. After the onset of the disease in Daejeon, it can be sprayed with 20% Virus A WP 500 times.
2. Pests: Cabbage field pests include Pieris rapae, Plutella xylostella, Spodoptera exigua, Brassica juncea, Brassica juncea, Smilax glabra, etc. General control of cabbage caterpillars, Plutella xylostella, Brassica napus and Noctuidae larvae, available 25% fast kill Ling 1500- -2000 times liquid spray or pyrethroid pesticide 2000-3000 times spray. The suspension was sprayed with 25% diurea gum suspension 500-1000 times. With 1.8% avermectin and 2.5% beta cypermethrin EC spray, the use of highly toxic, highly toxic pesticides is strictly prohibited. Prevention of earthworms and earthworms can be controlled by high-efficiency cypermethrin spray, 50% DDV75-100 can also be used for mu, and 15-20 kg can be sprayed and mixed with 3-4 kg of water and sprinkled in the field to control.
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