At the moment when cotton budding bells are in full bloom, it is expected that the fourth generation of cotton bollworms will be moderate to moderately serious this year. After comprehensive analysis, this year's fourth-generation H. armigeras will have an incubation period of August 11 to 27 on August 11 and 3 hatching peaks on August 11, 20, and 27. Farmers should do a good job in preventing and controlling cotton bollworms in a timely manner, focusing on controlling four generations of cotton bollworm and treating other pests. Agricultural control: Strengthen the management of cotton fields, such as topping, wiping off buds, and removing the heart, etc. The erased buds must be taken out of the cotton fields. This will eliminate some eggs. Chemical control: 3 times on August 11-12, 19-21, and 27-29. The 1st introgression of the fourth generation of cotton bollworm, the second generation of red bollworm and other pests, the first 2-3 indications of cotton bollworm, and other pests such as Spodoptera litura. Drugs for prevention and control can be selected according to the actual situation in the local area: 5% Suppressor, 15% Dupont, 22% insecticide net, 50% phoxim and Bt preparations, etc. Acetochlor can be added to cotton fields that are seriously affected by cotton leafhoppers. Governance. Chemical defense requirements: First, use a sufficient amount of water, even spray, the first time to cure the second generation of red bollworm to penetrate the whole plant, the first 2-3 times to focus on the upper part of the cotton shoots 4 stalls fruiting green parts; second is spraying After checking the control effect, the cotton field with high cotton bollworm residue should be supplemented and treated in a timely manner. Third, rational use of drugs should be used alternately. The medication should be used in the morning and evening when cool, avoiding medication during high temperature.
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