Cabbage virus disease is also called "cramps." When the Chinese cabbage was onset, the leaves appeared veins and mosaics, shrinking, distorting, necrotic spots, stripe spots, and plants exhibited dwarf flower malformations. Chinese cabbage could be susceptible to disease from the seedling stage to the heart-filling stage. High temperature and drought, especially under high night temperature conditions, are weak conditions and are important external conditions for infection. The locusts are mainly transmitted and spread by the media.
Control methods:
1, choose anti-virus varieties. Such as Beijing New No. 1, Baotou Qing, Beijing Daqingkou, etc.
2, appropriate sowing or sowing later, can reduce the incidence.
3. Strengthen seedling management. Diligent watering, no seedlings, strong resistance to disease.
4, timely control of locusts. It was found that the locusts were immediately sprayed and prevented, and 40% dimethoate EC 2000 times, or 20% chlorfenuron EC 3000 times could be sprayed as soon as they were prevented, and 0.3% potassium dihydrogen phosphate could be added when spraying. Efficacy and ability to enhance disease resistance of vegetable strains.
5, found that the diseased plants should be immediately removed by burning or deep buried, and spraying the diseased plant spirit 500 ~ 800 times for control.
6. In the early stage of the disease, spray 15% of plant disease and disease emulsion 1000 liquid, spray once every 10 days, spray 2-3 times continuously.
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