Cotton wilt and verticillium wilt are extremely harmful and devastating in cotton production. Once it occurs, a large number of dead seedlings are caused during the seedling stage. There are a large number of fallout bells, plant deaths, and serious losses. Cotton fusarium wilt and Verticillium wilt are all vascular diseases that are systematically infested. Their prevention and control methods are basically the same. Prevention should be the main method for prevention and control. Its prevention measures are as follows:
1. Strengthen seed quarantine. It is forbidden to transfer cotton seed, cottonseed cake and cottonseed hull from the ward.
2, choose resistant varieties. In cotton production, disease-resistant varieties were selected to improve plant disease resistance and control disease occurrence.
3, the implementation of rotation down. The rotation of severe disease fields can be changed for three to five years with cereals such as wheat and corn.
4, for seed treatment. Good cotton soaking before the seed sowing, seed dressing work, destroy the germ on the seed, or use coated cotton seed.
5. Strengthen field management. Diligent cultivator, deep cultivator, raised ground temperature, reduced soil moisture. Ditch drainage to reduce the water table. Increase the use of organic fertilizer and phosphorus and potassium fertilizers to avoid partial application of nitrogen fertilizer.
6. Do a good job of prevention before budding. The budding stage of cotton is a critical period for the occurrence and development of cotton withered and verticillium wilt, and can be used to spray potassium dihydrogen phosphate, fulvic acid salt, green wind 95 and other nutrients in order to increase the disease resistance of cotton plants. Reduce the incidence of diseases.
7, do a good job after the onset of remedial work. 1 After the sporadic strains are found in the field, the concentrated burns should be immediately removed and the diseased holes and surrounding areas should be disinfected. 2 The method of spraying and irrigating roots can be used for serious land masses. Use 3% Guanghe Lingshui agent 300-500 times, or 12.5% ​​Zhiweiling 200-250 times, add potassium dihydrogen phosphate, green wind 95 to spray, spray 5-7 days, even spray 3 - 4 times. Irrigation, 50-100 ml of liquid per plant can reduce the hazards and control the spread of the disease. In case of non-pathological plots, fulvic acid organic fertilizer or green wind 95, potassium dihydrogen phosphate and other foliar fertilizers should be sprayed to increase the disease resistance of the cotton plants, reduce the incidence, spray once every 7-10 days, and even spray 2-3 Times.
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