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据资料分析,棉铃虫越冬基数大小与翌年一代棉铃虫发生程度有很大联系,而一代发生程度又与二代发生程度成正比,即越冬基数大,一代棉铃虫发生严重,二代发生也严重。棉铃虫属杂食性害虫,近几年其抗药性逐渐增强,越冬基数逐年增多,危害逐年加重。四代棉铃虫老熟后是钻入表土层化蛹越冬的。冬季是棉铃虫生命力最薄弱的环节,其抗逆力最差。此时,如果在入冬前进行一次冬耕冬灌,不但能熟化土壤,提高贮存雨雪能力,而且还可
According to data analysis, the size of the bollworm overwinter base is closely related to the occurrence of the next generation of cotton bollworm. The degree of occurrence of the generation is directly proportional to the occurrence of the second generation, that is, the overwinter base is large, the generation of cotton bollworm is serious and the second generation is also serious . Helicoverpa armigera is a omnivorous pest. In recent years, its resistance gradually increases, the base of overwintering increases year by year, and its harm increases year by year. Four generations of cotton bollworm is over-drilled into the topsoil pupae. Winter is the weakest part of the vitality of cotton bollworm, the worst resistance. At this point, if a winter plowing winter irrigation before winter, not only can be matured soil, improve storage capacity of snow and rain, but also