Chinese cabbage virus disease prevention
Agricultural Control 1. Use resistant varieties to avoid continuous cropping. Planting experience has proven that in general Qinggang Qingye cultivars are more resistant to disease. Different other cruciferous crops are close to each other, but not with cruciferous crops, which can effectively prevent the occurrence and spread of diseases; 2. Suitable late sowing, covering cooling. According to planting experience, proper late planting can effectively prevent the occurrence and spread of disease. Seedling period using early seedlings, light between the seedlings, more seedlings, the appropriate method of setting the seedlings in the evening, the ground mulch to cover the ground cooling, but also can effectively prevent the occurrence and spread of the disease; 3. Rational fertilization, strengthen management. Apply base fertilizer and increase phosphorus and potassium fertilizers. Cultivate strong seedlings and remove the diseased plants in time; 4. Inoculate ground water during seedling stage. It is mainly used for pouring, reducing the friction and damage of humans, animals and agricultural machinery and plants when planning. Note that in the drought year, small water should be poured, and the ground should be kept dry so that the seedlings will not be affected by drought.
Chemical control 1. Miao Qi sprayed 20% virus A wettable powder 500 times liquid plus 10% imidacloprid 2000 times liquid plus sea cucumber (foliar fertilizer) 20 ml. 2. Spray Dendrobium before Dingmiao to kill 500 times of liquid plus 5% of acetamiprid 1000 times and add sea cucumber (foliar fertilizer) to 20 ml. 3. Spray 5% Aspergillus water solution 300 times and 5% acetamiprid 1000 times. 4. Spray Baidu Ling No. 1 500 times and 5% acetamiprid 1000 times. The above agents can be sprayed for 5 to 7 days, sprayed continuously or alternately, and sprayed 2 to 3 times. In the absence of locust damage, acetamiprid or imidacloprid can be lost.
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