随着三氯杀螨醇等杀螨剂的连年使用,棉叶螨抗药性日益增加。1987年我们选用了20％丰收菊酯可湿性粉剂,每亩100克,20％双甲脒、单甲脒、杀螨脒乳油每亩各50毫,升,于螨峰期进行了田间试验。结果表明,施药后一天,丰收菊酯的防效为90.3％,双甲脒为83.2％。单甲脒和杀螨脒防效较差,仅为65.2％和65.7％;药后三天,四种药剂 With the continuous use of acaricide such as dicofol, cotton spider mite resistance is increasing. In 1987, we selected 20% Harvest Inulin wettable powder, 100 grams per acre, 20% amitraz, amitraz and acyclovir 50ml per acre, per liter, in the mite peak field trials. The results showed that, one day after spraying, the control effect of fenchin was 90.3% and amitraz was 83.2%. Monoammidine and acetamiprid were less effective, only 65.2% and 65.7%; three days after treatment, four agents