朝阳地区年年发生棉蚜为害,由于药剂防治效果不好,对棉花生产威胁很大。近年来改进了施药方法,保护了天敌,控制了蚜害,效果甚好。一、朝阳地区棉蚜向棉田迁飞,一般5月下旬至6月上旬出现第一次高峰,发生早的年份,5月中旬棉苗就会受到危害。这个时期棉苗刚出土,瓢虫、蜘蛛等天敌也刚刚开始在棉田活动。如过早 Cotton aphid occurs annually in the Chaoyang area. Because of poor pesticide control effects, it is a threat to cotton production. In recent years, the application of pesticides has been improved to protect natural enemies and control aphid infestation. First, the cotton aphid fly in the Chaoyang area, generally late May to early June appeared the first peak, the early years occurred, in mid-May cotton seedlings will be harmed. Cotton seedlings just unearthed this period, ladybugs, spiders and other natural enemies have just begun activities in the cotton field. If too early