关键词: 德国小蠊, 高效氯氰菊酯, 毒死蜱, 乙酰甲胺磷, 残杀威, 溴氰菊酯, 抗药性

Abstract:

Objective To investigate the susceptibility of Blattella germanica to five commonly used insecticides, beta-cypermethrin, chlorpyrifos, acephate, propoxur, and deltamethrin, in Fengtai district of Beijing, China, and to provide a scientific basis for proper use of insecticides. Methods A large number of adult B. germanica individuals were collected in a farmer's market in Fengtai district to obtain the first filial generation for testing in the laboratory. The insecticide film contact method, as recommended by the WHO, was used to determine the susceptibility of B. germanica to commonly used insecticides, and the median knockdown time (KT₅₀) and corresponding 95% confidence interval (95%CI), knockdown rate, and mortality of B. germanica were used for estimating the resistance levels to commonly used insecticides. Results The mean resistance coefficients (R/S) of B. germanica to beta-cypermethrin, chlorpyrifos, acephate, propoxur, and deltamethrin were 7.91, 2.06, 2.79, 4.56, and 30.52, respectively, and the five commonly used insecticides had the rates of decrease in lethal effect within 24 hours at 100%, 13.33%, 20.00%, 73.33%, and 90.00%, respectively. Conclusion B. germanica in Fengtai district of Beijing have developed high resistance to deltamethrin and beta-cypermethrin, but its resistance to organophosphorus and carbamate insecticides such as chlorpyrifos and propoxur is relatively low, which may be due to the differences in the frequency and way of insecticide use.

Key words: Blattella germanica, Beta-cypermethrin, Chlorpyrifos, Acephate, Propoxur, Deltamethrin, Insecticide resistance