朝阳为北方特早熟棉区。棉铃虫也和全国各地一样，是棉花的最主要害虫。近年来连续重发生。１９９２年为特大发生，使棉花减产５０％以上，有的地块绝收。１９９３～１９９８年均为偏重发生和大发生。防治棉铃虫已成为棉花生产必不可少的最重要环节。１发生世代和特点１．... Chaoyang as early as the northern cotton area. Cotton bollworms, like all parts of the country, are the main pests of cotton. In recent years, continuous re-occurrence. In 1992, the outbreak occurred, so that more than 50% reduction in cotton, and some plots. From 1993 to 1998, both emphasis and occurrence occurred. Control cotton bollworm has become an essential part of cotton production is essential. Generations and characteristics occur 1. ...