The pathogens of autumn cabbage virus disease are mainly cucumber mosaic virus, turnip mosaic virus and tobacco mosaic virus, which are transmitted through aphids or direct contact. The seedlings are most susceptible before the 7th leaf stage. The color of the young leaves is lightened and translucent. The leaves on the back leaves produce light green and dark green and mottled. The growth rate of the leaves is slowed down, forming wrinkled leaf and turning sideways. inverted. Plants with early onset can't pack. Some leafballs are normal in appearance, but there are brown necrotic spots on the inner leaves. They often die before the core or form a "jammy", affecting food and storage. Its prevention measures are as follows.
Agricultural control (1) Use resistant varieties to avoid continuous cropping. Practice has proved that the general Chinese cabbage varieties of Qinggang Qingye are more resistant to disease. Avoid adjacent or continuous crops with cruciferous crops to reduce disease occurrence. (2) Appropriate late sowing, avoiding the peak of locust occurrence and avoiding the occurrence and spread of viral diseases. (3) Strengthen field management and cultivate strong seedlings. Apply base fertilizer and increase phosphorus and potassium fertilizers. In case of drought, water is poured and the soil is kept moist. The diseased plant was found to be removed promptly.
Chemical control in time to control aphids, 5% acetamiprid EC 1000 times or 10% imidacloprid WP 2000 times spray. Early onset of the virus can be sprayed 20% do not èƒ copper acetate WP 500 times or plant disease 1.5% alkanol sulfate copper water emulsion 1000 times every 5 to 7 days, continuous control of 2 or 3 times.
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