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棉铃虫在湖南滨湖地区每年发生四代,少数不完整的五代。第三代出现少数滞育蛹,第四代蛹绝大多数滞育越冬,极少数可在当年羽化,幼虫越冬全部死亡。10月上、中旬幼虫下降至3—10厘米的土层中化蛹越冬,蛹的不同发育程度、色泽变化及各虫态历期均与温度变化有关。成虫交配一般在下半夜,雌蛾羽化后1—2天开始产卵。未受精卵约占总产卵数的34％。 玉米受害重于棉花,晚熟品种重于早熟品种。 保棉丰加敌敌畏的混合液,防治棉铃虫能起到很好的效果,并能兼治斜纹夜蛾和红蜘蛛。
Cotton bollworm occurs four generations a year in Hunan Binhu area, a few incomplete five generations. The third generation of a few diapause pupa, the fourth generation of pupal overwhelming majority of diapause, a very small number of feathering in the year, the larvae all died in the winter. In mid-October, mid-term larvae dropped to 3-10 cm of soil overwintering pupae, pupae of different development levels, color changes and the status of each worm stage and temperature changes. Adult mating generally in the middle of the night, females 1-2 days after the emergence of spawning eggs. Unfertilized eggs account for about 34% of the total number of eggs. Corn harms more than cotton, late-maturing varieties are heavier than early-maturing varieties. Cotton plus Fengfeng dichlorvos mixture, control bollworms can play a very good effect, and can both control louse and spider mite.