稻飞虱是南方稻区晚稻后期主要虫害，药剂防治是控制精S虱为害的重要手段。在浙江省危害晚稻的主要是第5代褐稻虱。由于褐稻虱繁殖快，世代重叠严重，常用药剂对高龄若虫和成虫效果不够理想。因此在防治上采用“治四压五”策略，以控制5代精虱的危害。在稻虱发生量较大年份，需 Planthopper is the main late rice late rice pests in southern rice, pesticide control is an important means to control the fine insects S lice. The main damage to late rice in Zhejiang Province is the 5th generation brown planthopper. Due to rapid propagation of brown planthopper, generations of serious overlap, commonly used agents on the elderly nymphs and adults less than ideal. Therefore, in the prevention and control on the “rule four pressure five” strategy to control the harm of the fifth generation of sperms. In the larger amount of planthopper year, required