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由于在豆田大量施用农药防治大豆蚜,杀死大量天敌,引起大豆蚜发生为害频率不断增加。为了保护天敌,我们改进了施药方法来防治大豆蚜,于1976年7月21日在大豆蚜为害繁殖盛后期,每亩用50％异丙磷乳油1两与20斤细土拌均匀和40％乐果乳油1两拌20斤细土,将配好的毒土每隔五垄施一垄,施药后48小时后50％异丙磷乳油毒土防治效果94.3％;40％乐果乳油毒土防治效果86.4％。
As a large number of pesticides in soybean fields to control soybean aphid, kill a large number of natural enemies, causing the occurrence of soybean aphid frequency increased. In order to protect the natural enemies, we have improved the pesticide application method to control soybean aphids. On July 21, 1976, the soybean aphid was harvested at the late stage of its breeding. 50% % Dimethoate dimethoate 1 mixed with 20 pounds of fine soil, will be equipped with a good ridge every five ridge ridge facilities, 48 hours after application of 50% of the phosphorus prevention and control of toxic phosphorus soil 94.3%; 40% dimethoate Toxic soil control effect of 86.4%.