In the winter, pests in cotton fields are prevented and used with less labor, less investment, simple method, and high efficiency. The specific points should be grasped as follows. 1. Clean up garden cotton red bollworms, red spiders, aphids, thrips, blind beaks, etc., can overwinter on dead branches, fallen leaves, bells and weeds left over from the cotton fields, remove dead branches, fallen leaves, and drop bells. The weeds around the cotton fields can effectively remove the above-mentioned overwintering pests. Eradication should be centralized, burned in time or buried in a timely manner. 2. Deep-sweep soil cotton bollworms, ground tigers, Spodoptera litura, bridge-building insects, etc. in the soil in winter, can be implemented to turn soil to kill. The soil is required to have a depth of 30 to 40 cm. The topsoil is turned to the bottom, and the subsoil is turned to the top. The overturned large earth blocks are not broken so as to facilitate winter weathering. 3. Irrigation and Insecticide Irrigation on the basis of earth turning can more thoroughly kill overwintering pests in the soil. Irrigation should be carried out on the "39" days, and it should be thoroughly irrigated. Generally, the irrigation volume per mu is 80 to 120 tons. Fill the clay a little bit more, and the loam can be a little less. The irrigation method is suitable for furrow irrigation, so that the water slowly infiltrates the room and avoid flooding. 4. Fumigation of drugs Fumigation of red bollworms, anthrax pathogens, carrageenan, red rot pathogens, etc., can be attached to the seeds for winter, and the fumigation of drugs can kill 98% of the red bollworms and some pathogens in the cotton seeds. The first is to seal the gap in the warehouse, and use 32-37 grams of methyl bromide per cubic meter of space for 3 days. 5. Elimination of storage sites insect source Cotton bollworms mainly hide in the flower storage warehouses and ginning plants in the four-wall gap in winter. Therefore, the four walls of the flower plant can be sprayed with lime slurry and filled with gaps. Drying tools must be washed with boiling water. The stencils and wastes of the ginning factory should be promptly removed, fattened or burned.
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