For the cotton field with more than 0.25 strains of disease, manually remove the diseased plant, excavate the diseased soil, or use 16% ammonia or chloropicrin, formalin, and 90-95% alkaloid powder to fumigate or disinfect the soil. In the peak season of June to July, the disease-centered disease is the center of the diseased plant. 25 wells with a depth of 20 cm per m2 are injected into each well. Each well is filled with ammoniated bitter 5 ml (125 ml), and the soil is filled with water and soiled to protect against evaporation. , Then use 120 times crude crude emulsion or more than 6% ammonia solution containing ammonia 1:1 5L to eradicate, you can eliminate the disease point of Verticillium dahliae, generally per liter of 25% irrigating solution. It is also possible to treat the soil with 3.6 kg of active ingredient per 667 m2 of 90%-95% cotton.
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