豆秆黑潜蝇是大豆作物上的一种主要害虫。它除为害大豆外,还为害赤豆、绿豆、四季豆、大青豆、豇豆等多种豆科作物,其中以大豆、赤豆受害最重。近年,我们采取边试验、边示范、边推广的做法,1974年防治5,000亩,1975年达5.5万亩,1976年四县协作区防治面积20万亩。根据各点测产的情况,防治二 Stem Black-moth is a major pest on soybean crops. In addition to harm to soybeans, it also harms red bean, mung bean, green beans, green beans, cowpea and other leguminous crops, of which soybeans, red beans most affected. In recent years, we have adopted the measures of experimenting while demonstrating and expanding our work. In 1974, we controlled 5,000 mu of land in 1975 and 55,000 mu in 1975. In 1976, the control area of ​​the four counties was about 200,000 mu. According to the situation of the measured output, prevention and control two