稻秆蝇在我县,七十年代只零星发生为害高山区的单季晚稻.近年来,随着耕作制度的改革,杂交水稻面积的扩大,播种时间提早,稻秆蝇种群数量迅速增加,发生面积逐年扩大,为害程度渐见加重.1984年我县发生受害的面积达1.85多万亩,其中早稻3500亩,损失 Rice flies in our county in the seventies only sporadic occurrence of single-season late rice damage in high mountain areas.In recent years, with the reform of tillage system, the expansion of hybrid rice area, sowing time earlier, the rapid increase in the population of rice stalk flies occurred The area has been expanding year by year, and the degree of harm has been aggravating. In 1984, the area affected by my county reached more than 1.85 million mu, including 3500 mu for early rice, loss