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How to prevent cotton scab?
When cotton is infected with black star disease, the bell shell becomes black, stiff and does not crack. Small black spots on the bell shell. If the whole bell is covered with smoky coal powder under high humidity, it is necessary to take timely control measures:
1. Thoroughly remove the sputum residue before planting, deep-turn the whole, spray disinfectant on the whole garden for disinfection and sterilization, effectively reduce the residual bacteria in the soil.
2, select excellent varieties of disease resistance, use disinfectant for seed soaking before planting. After the next seed, the surface of the soil is sprayed with a new high-fat film to protect the surface layer density and increase the emergence rate.
3, the base fertilizer is applied, mainly organic fertilizer, phosphorus and potassium fertilizer are added to improve the disease resistance of the plant. Irrigation at the right time to meet the water demand. Note that watering should be controlled after planting until the flowering and ringing period.
4, regular inspections, found that the diseased plants were removed in time, brought out of the field for centralized burning or deep burial, field sprayed tree guards for general disinfection. In areas where the incidence is concentrated, the targeted fungicides can be sprayed in time to effectively control the damage of black spot disease and protect the healthy growth of cotton plants.
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