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溴氰菊酯、氧化乐果、杀虫脒和三氯杀螨醇对硃砂叶螨连续选择3代后,该螨对这些药剂的敏感度分别降低了6.23、1.16、1.23和2.24倍。而4种药剂12个轮换用药组合的敏感度则有不同程度的提高。组建雌性生命表表明,4种药剂对各螨态历期均有不同程度的缩短,Ro、γm、λ各值以溴氰菊酯最高,分别为23.191、0.213、1.139;氧化乐果LC_(50)处理组各数值亦略高于对照组,分别为21.548、0.204、1.226;杀虫脒、三氯杀螨醇处理组各数值略低于对照组。田间试验证实,连续用药3次的三氯杀螨醇、杀虫脒和氧化乐果的较高浓度处理区均能大大降低螨群数量,而溴氰菊酯处理区的螨群数量比对照区高出6.39和8.77倍,认为溴氢菊酯对叶螨的毒性低、刺激增殖、驱使分散和杀伤灭敌而诱使叶螨发生再猖獗。
Deltamethrin, omethoate, chlordimeform, and dicofol decreased the sensitivity of these mites to these agents by 6.23, 1.16, 1.23, and 2.24 times, respectively, after being continuously selected for three generations. While the sensitivity of 12 combinations of 4 kinds of medicaments has different degrees of improvement. The establishment of the female life table showed that the four agents had different degrees of shortening on each mite state, and the values of Ro, γm, and λ were the highest with the values of 23.191, 0.213, and 1.139, respectively; the omethoate LC_ (50 ) In the treatment group was also slightly higher than the control group, respectively, 21.548,0.204,1.226; chlordimeform, dicofol treatment group, the values were slightly lower than the control group. Field trials confirmed that the higher concentrations of dicofol, chlordimeform and omethoate treated three times in a row could significantly reduce the number of mites, while the number of mites in the deltamethrin-treated area was 6.39 and 8.77-fold, that thalagramethromycin spider mites on the low toxicity, stimulate proliferation, to disperse and kill disperse the enemy and induce spider mite re-rampant.