1. Symptoms: There are two types, one is mosaic type: the leaves produce uneven green patches or mosaics; the second is shrinkage type: the heart leaves are shrinking deformed, hard and brittle. 2. Cause of the disease: The occurrence of the disease is related to climate, management and other factors. After the sowing of cabbage, it encounters high temperature and drought, the growth of the root system is inhibited, and the resistance to disease is reduced. In addition, high temperature and drought are favorable for the occurrence of aphids. The probability of transmission of the virus is high and the virus disease occurs. serious. In addition, extensive management, lack of water, lack of weight loss. 3, control measures: cabbage virus disease spread by the locust, so the control of aphids is essential, can be used 10% imidacloprid 2000 times spray, once every 7-10 days, even the defense 2-3 times. After the cabbage is infected, spray 1.5% of Shilingling No. 2 800 times liquid or virus killer, Kangrun No. 1 1000 times liquid foliar spray once a week for 2-3 times.
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