三化螟是水稻的主要害虫之一,是专吃水稻的单食性害虫,造成水稻的枯心(死苗)和白穗,严重地影响了水稻的产量,近年来,由于耕作制度的改革,单季改双季,旱、中、晚稻混栽,稻油、稻麦、绿肥面积增加,扩大了虫源田的面积,在适当的气候条件下,随着其发生数量增加,为害亦即加重。在城关坝上,为害水稻的虫害有二化螟、三化螟、大螟、稻飞虱、叶蝉、纵卷叶螟、稻苞虫等。据调查主要是三化螟的为害面 The stem borer is one of the major pests of rice and is a pest eating pest of rice. It causes the withered heart (dead seedling) and white ear of rice and seriously affects the yield of rice. In recent years, due to the reform of farming system, Single season changed double season, dry, middle and late rice mixed planting, rice oil, rice and wheat, green manure area increased, expanding the area of ​​insect fields, in the appropriate climatic conditions, with the increase in the number of its occurrence, that damage is aggravating. In the Chengguan dam, damage pests of rice borer, Borer, Sesamia inferens, planthoppers, leafhoppers, leafroller, rice shell insects and so on. According to the investigation is mainly the damage surface of rice borer