1987年测定了呼和浩特市家蝇对溴氰菊酯和二氯苯醚菊酯的抗药性,溴氰菊酯的LD50为0.0002μg,/♀蝇,属敏感水平,二氯苯醚菊酯的LD50为0.0112～0.0137μg/♀蝇,呈中抗水平,1981年开始使用以该药为主的“灭害灵”灭蟑螂和灭蝇,时间长,用量大,范围广,操作不当,可能是该药抗性上升快的主要因素。比较了1987、1984和1981年家蝇对敌百虫、敌敌畏和丙体666的抗性发展水平其中敌百虫和敌敌畏1987年LD50 In 1987, the resistance of housefly to deltamethrin and permethrin in Hohhot was determined. The LD50 of deltamethrin was 0.0002μg / g, which is a sensitive level. The LD50 of permethrin Was 0.0112 ~ 0.0137μg / flies, was moderate anti-level, began in 1981 to use the drug-based “exterminator” off cockroaches and flies, a long time, a large amount, a wide range of improper operation, it may be the The main factor that drug resistance rises fast. The levels of resistance to trichlorfon, dichlorvos and cv666 in house flies in 1987, 1984 and 1981 were compared. Among them, the trichlorfon and dichlorvos 1987 LD50