Autumn is the season when cabbage grows. It is also a period of frequent occurrence of viral diseases. The disease can occur in all fertility of Chinese cabbage. If you do not pay attention to prevention and control, it will cause serious losses. Liang Yan, a professor at the College of Horticulture, Northwest Agriculture and Forestry University, said that there are two types of cabbage virus disease, a mosaic type. Leaves produce uneven shades of green mottled or mosaic; 2 Shrinkage type. Heart leaves appear to be deformed, 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.
Prevention and control measures: 1 Select disease-resistant varieties and appropriate late-planting varieties to postpone the sensitive period until the cool and cold season, avoid disease conditions, reduce the incidence rate, and avoid continuous cropping with cruciferous vegetables. 2 timely removal of diseased plants to reduce the spread of pathogens. (3) Cultivation with flat ridges or small high ridges, pouring ground water to keep the ground moist, reduce ground temperature, and reduce the incidence. 4 do a good grasp of locust control, available 10% imidacloprid wettable powder 1500 times spray every 7 to 10 days once, even against 2 to 3 times.
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