稻纵卷叶螟(Cnaphlocrocis medinalis Guenee)是我国稻区重要食叶性害虫之一。分布很广,六十年代中期以来,普遍大发生,严重威胁水稻的高产稳产。江西年发生五代为主,常年以第二代(6月上、中旬)为害早稻孕穗——抽穗期为重,少数年份第四、五代也能大发生。水稻受害后,表现千粒重降低,空壳率增加,损失很大。但其受害经济阈值问题的系统论述,目前报道尚少,各地防治指标也不完全一致,一般都把百丛 Cnaphlocrocis medinalis Guenee is one of the most important leaf-eating pests in the paddy field in China. Distribution is very wide, since the mid-sixties since the widespread occurrence of a serious threat to high and stable yield of rice. Five generations occurred in Jiangxi Province. Perennial second generation (June, middle) affected pears of brisk rice - heading date was the heaviest, and in a few years the fourth and fifth generation also occurred. Rice damage, the performance of reduced grain weight, shell rate increases, a great loss. However, there are still few reports on the economic threshold of economic victimization, and the indicators for prevention and control in various places are not exactly the same. Generally,