1990年以来，棉铃虫在我国南北棉区连续几年大发生，给棉花生产造成巨大损失，成为制约棉花生产的关键因素之一。在我地尤以二代棉铃虫发生最重，占全年发生量的60％以上，它危害棉花嫩叶、幼蕾，造成大量落蕾。多年试验证明，对于二代棉铃虫的防治，应坚持以保顶为中心，狠抓 Since 1990, the cotton bollworm occurred in our country’s cotton fields for several years in a row, causing huge losses to the cotton production and becoming one of the key factors restricting the cotton production. In my field, especially the second-generation cotton bollworm occurred the heaviest, accounting for more than 60% of the annual occurrence, it endangered cotton leaves, young buds, resulting in a large number of falling buds. Years of testing proved that for the second generation of cotton bollworm prevention and control, should adhere to the top as the center, pay close attention to