根据外地经验于1981年、1982年我们推广使用敌敌畏毒士熏杀稻飞虱,群众对效果评价不一,为此,1983年做了验证: 一、9月20日,以每亩用敌敌畏分别为3两、4两、5两加水3斤,均匀喷在50斤细土上,闷半小时于下午5时分别撒入各小区(每个小区0.2亩,设三个重复)其防效平均各为72.3％、91.6％、98％。 According to foreign experience in 1981, 1982, we promote the use of dichlorvos poisoning smite the planthopper, the masses of different effects on the evaluation, for which, in 1983 to verify: First, on September 20, per mu with dichlorvos respectively 3 3 two, four two, five two water plus 3 pounds, evenly sprayed on 50 pounds of fine soil, boring half an hour at 5 pm, respectively, scattered into the community (0.2 acres of each plot, set three repeats) Each is 72.3%, 91.6%, 98%.