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据历史资料分析,棉铃虫越冬基数大小与翌年一代棉铃虫发生程度相关,而一代发生程度又与二代发生程度成正比,即越冬基数大,一代棉铃虫发生重,二代发生也重。棉铃虫属杂食性害虫,近几年抗药性强,越冬基数逐年增多,危害逐年加重。冬季是棉铃虫年生活史中最薄弱的环节,抗逆力最差,四代棉铃虫老熟后钻入表土层化蛹越冬,大地
According to historical data analysis, the size of the bollworm overwinter base is related to the occurrence of the next generation of cotton bollworm. The occurrence of the generation is directly proportional to the occurrence of the second generation, that is, the overwintering base is large, the generation of cotton bollworm is heavier, and the generation of the second generation is also heavier. Helicoverpa armigera is a omnivorous pest. In recent years, the drug resistance is strong, the base of overwintering increases year by year, and the harm increases year by year. Winter is the weakest link in the annual life history of cotton bollworm, with the worst resistance. The fourth generations of cotton bollworms drilled into the topsoil pupation overwintering,