甜菜夜蛾(Laphygma exigua Hubner)食性杂,但在棉田严重发生为害尚属少见。 在我场1988年发现此虫为害夏播棉苗,以后逐年加重,至1991年在全场大范围暴发,受害春、夏棉面积达6万多亩。此蛾在该地每年发生6代,在棉花上可发生为害4代。成虫喜在作物长势差 Beet armyworm (Laphygma exigua Hubner) feeding complex, but serious damage in the cotton field is still rare. In 1988, it was found that this insect harmed summer cotton seedlings, and then increased year by year. By 1991, large-scale outbreaks were reported in the audience and affected spring and summer cotton fields reached more than 60,000 mu. This moth occurs 6 generations per year in the area, which can occur on cotton for 4 generations. Adults like poor crop growth