First, the onset of symptoms: divided into two types, one is the mosaic type: the leaves produce uneven shades of green mottled or mosaic; the second is shrinking type: the heart leaves show shrinkage deformity, hard and brittle. The occurrence of this disease is related to climate, management and other factors. After sowing cabbage, it encounters high temperature and drought, root growth is inhibited, and disease resistance is reduced. In addition, high temperature and drought are favorable for the occurrence of aphids, high risk of virus transmission, and serious viral disease. In addition, extensive management, lack of water, lack of weight loss.
Second, prevention and control measures: cabbage virus disease spread by the mites, so the control of aphids is essential, can be used 10% imidacloprid 2000 times spray, once every 7-10 days, even 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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