稻秆蝇[Chlorops oryzae(Matsumura)]自70年代在我县发现为害以来,一直是高山区单季稻上的主要害虫,最近几年该虫向低海拔山区迁移,成为整个山区早稻、单季稻上的最主要害虫,为害程度并有渐进的趋势,据我们调查1980～1989年平均发生面积为7.02万亩,占水稻面积29.2%,年损失粮食2378吨.我们自1980年开始对该虫发生规律和防治途径作了一些调查观察和试验,现将结果报道如下: Chlorops oryzae (Matsumura) has been a major pest on single-cropping rice in high mountainous areas since it was discovered in our county in the 1970s. In recent years, the insect migrated to lower-altitude mountainous areas and became the most abundant rice in the whole mountainous areas. According to our investigation, the average area occurred in 1980-1989 was 7.02 million mu, accounting for 29.2% of the total paddy area, with an annual loss of 2378 tons of grain. Since 1980, we have started to study the law and control of the pest Way to make some observations and experiments, the results are reported as follows: