二化螟是水稻的主要害虫之一。浙江省第一代二化螟孵化盛期一般在5月上、中旬(早稻本田分蘖初期、盛期),历期在12～15天,因而各地防治时间比较混乱,既浪费了农药、花费了工本,效果又不理想。为了确定准确有效的防治适期,我们于2004～2005年从螟害株发展动态、枯鞘枯心对产量的 Chilo suppressalis is one of the major pests in rice. The first generation of thrips hatchlings in Zhejiang Province during the peak incubation period generally in May, mid (early rice Honda early tillering period), the period of 12 to 15 days, so control over the time of confusion, not only wasted pesticides, spent Works, the effect is not ideal. In order to determine the accurate and effective control of the appropriate period, we from 2004 to 2005 from the development of stem borer dynamics, withered dead withered yield on