目前,在农药药效试验中,对害虫虫口密度和数量增减的调查普遍运用的是直接计数法,即一个一个数虫子的办法。这种方法在调查一些个体小、密度大、繁殖快、繁殖量大的害虫如蚜虫、红蜘蛛时,使人感到费工、费时间,结果也不可能作到没有误差。特别是试验处理项目多,设置小区多、重复次数多的农药药效试验中,更使调查人感到 At present, in the pesticide efficacy test, the survey of population density and quantity of insect pests commonly used is the direct counting method, that is, one by one number of bugs. This method makes people feel time-consuming and time-consuming in investigating small, dense, reproductive, and reproductive insect pests such as aphids and spider mites. In particular, the experimental treatment of many projects, set up more plots, repeat the number of pesticide efficacy test, but also make the investigators feel