Notes on the use of drugs for the Prevention and treatment of virus Diseases in Chinese Cabbage

Agricultural prevention and control 1. Select disease-resistant varieties and avoid continuous cropping. Planting experience has proved that the general varieties of Qingbang Qingye line are relatively disease-resistant. Different from other cruciferous crops close neighbors, not continuous cropping with cruciferous crops, can effectively avoid the occurrence and spread of diseases; 2. Suitable time for late sowing, covering and cooling. According to planting experience, appropriate late sowing can effectively prevent the occurrence and spread of diseases. Seedling stage using early seedlings, light seedlings, more seedlings, appropriate late seedling method, vegetable seedlings cover the ground to cool down, can also effectively avoid the occurrence and spread of diseases; 3. Rational fertilization and strengthen management. Apply sufficient base fertilizer and increase phosphorus and potash fertilizer. Cultivate strong seedlings and pull out diseased plants in time; 4. Irrigation frequently at seedling stage. Mainly to irrigate, hoe to reduce human and animal and agricultural machinery and plant friction and damage. Pay attention to the frequent watering of small water in dry years to keep the land dry so that the seedlings will not be affected by drought. Chemical control 1. After Miaoqi, 20% virus A wettable powder was sprayed with 2000 times of imidacloprid and 20 ml of haisheng (foliar fertilizer). two。 Before fixing the seedling, spray the fungus poison and kill 500x solution, add 1000 times acetamiprid solution, and add Haisheng (foliar fertilizer) 20ml. 3. Spray 5% Aspergillus botanicus 300 times solution and 5% acetamiprid 1000 times solution. 4. Spray Baiduling No. 1 500x solution plus 5% acetamiprid 1000 times solution. The above chemicals can be sprayed continuously or alternately at intervals of 5 to 7 days for 2 or 3 times. Acetamiprid or imidacloprid can be reduced without the harm of aphids.