关键词: 德国小蠊, 抗性检测方法

Abstract: Objective To compare difference of two methods for insecticide resistance detection in the resistance ratio of the German Cockroach,Blattella germanica.Methods Insecticide resistance was detected by methods of WHO and Atkinson & Zhai respectively.Results The resistance ratio(RR) measured by surface contact was 6.93 folds for permethrin,13.85 for deltamethrin and 5.60 for cypermethrin based on KT₅₀.As measured by topical application,the resistance ratio based on LD₅₀ was 22.17 folds for permethrin,64.32 for deltamethrin and 27.03 for cypermethrin.It means that the resistance ratios of this insect to permethrin,deltamethrin and cypermethrin by topical application were 3.20,4.64 and 4.83 times higher than that by surface contact method.Conclusion The results suggested that surface contact method do not accurately assess insecticides susceptibility in field populations of German cockroaches,topical application was more sensitive than surface contact tests for measuring insecticide resistance.