二化螟是我县水稻主要害虫之一,一年发生三代.各代成虫盛发期:第一代4月下旬至5月上旬,第二代6月下旬至7月上、中旬,第三代8月下旬9月上、中旬.过去,历年以一代危害最重,二代次之,三代发生数量少,危害轻.近几年来,由于杂交稻的大面积栽培,改善了二化螟的生态环境,因 Chilo suppressalis is one of the major rice pests in our county, occurring three generations a year.During the flourishing period of each generation: the first generation from late April to early May, the second generation from late June to July, middle, third In late August, September and mid-August. In the past, the past generation of the most harmful to the generation, the second generation, the third generation of a small number of occurrence, endangering the light.In recent years, due to large-scale hybrid rice cultivation, improve the Chilo suppressalis Ecological environment, because