Cotton wilt disease and verticillium wilt are all vascular bundle diseases infested by the system. The prevention and treatment methods are basically the same. It is necessary to prevent it, and according to the disease situation of different cotton areas, different methods should be adopted according to local conditions.
(1) Agricultural control
1. Cultivation of resistant (resistant) species is now the most useful method. In cotton production, the disease-resistant species is selected to improve the disease resistance of the plants and control the onset of the disease.
2. Strengthen quarantine. It is strictly forbidden to transfer cotton seeds, cottonseed cakes and cottonseed hulls from the ward.
3, the diseased plants were removed from the diseased fields, and the soil was disinfected; the rotation of the Shentiantian was carried out, and the southern can be used for 2-3 years, and the north could be rotated with wheat, corn and other cereal crops for 3-4 years.
4. Strengthen field management. Diligent ploughing, deep cultivating, improving geothermal temperature, reducing soil moisture; ditching drainage, lowering the groundwater level; increasing the application of decomposed organic fertilizer and phosphorus and potassium fertilizer to prevent partial application of nitrogen fertilizer.
5. Do a good job of preventing the work before the bud. The bud stage of cotton is the key period for the onset and development of cotton blight and verticillium wilt. For some diseased cotton fields, the potassium dihydrogen phosphate, fulvic acid salt, green wind 95 and other nutrient agents are sprayed before the cotton plant is symptomatic. The disease resistance of the strain reduces the onset of the disease.
(2) Chemical control
1. Seed and soil treatment: Do a good job of immersion and seed dressing before cotton cultivation, eliminate the source of bacteria on the seeds, or use coated cotton. Soil disinfection of scattered disease points can be mixed into the diseased soil with 140% of 98% cotton granules per square meter.
2. Do a good job of making up after the onset of illness.
1 After the scattered diseased plants are found in the field, they should be immediately removed and burned, and the diseased spots and their surroundings should be disinfected.
2 Roots and sprays: Severe plots can be combined with spray and root irrigation.
Rooting, 50-100ml per solution, can reduce damage and control the spread of disease. For unoccupied plots, foliar fertilizers such as fulvic acid or potassium dihydrogen phosphate should be sprayed to improve the disease resistance of cotton plants and reduce the incidence.
Advocate: When entering the onset of cotton verticillium wilt and blight, about the two diseases that claim cotton "cancer", it is not satisfactory to be forced to do so-called drug control after the onset of the disease, the results are generally It is because of small loss.
The best way to prevent and cure the disease is to prevent problems before they occur. That is to say, broad farmers' friends strengthen the field view, find scattered cotton fields, timely remove the diseased plants and burn them, and disinfect the soil at the diseased plants.
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