关键词: 德国小蠊, 抗药性, 抗性动态

Abstract: Objective To understand the resistance dynamics of Blattella germanica to commonly used insecticide beta-cypermethrin, and provide the basis for the integrated pest management in different districts. Methods Insecticide resistance of 11 field strains B. germanica collected from hotels, gasthaus, farmer's markets, and small restaurants in Dongcheng, Xicheng, Chaoyang, Changping, Miyun, Huairou, Daxing, Shijingshan, Shunyi, Fangshan, and Mentougou district in 2014 and 2016, during May to July each year, were detected by surface contact method. The resistant ratio (RR) was calculated for each strain. Results The susceptibility of the field B. germanica strains to insecticide tested varied from different districts. The Dongcheng, Miyun, Huairou, Daxing, Xicheng, and Changping strains showed decreasing susceptibility to beta-cypermethrin, but Shijingshan, Chaoyang, Shunyi, Fangshan, and Mentougou strains showed increasing trend. The 11 field strains of B. germanica had low levels of resistance with RRs between 1.01 and 5.14 folds in 2014 and 2016 to beta-cypermethrin, except Shunyi strains with moderate resistance in 2014. The resistance change of Dongcheng and Mentougou stains was the widest, RR increased from 2.39 to 4.44 folds in Dongcheng strain, while RR decreased from 4.58 to 2.73 folds in Mentougou strain. Conclusion Field collected strains of B. germanica in different districts in Beijing had already developed different levels of resistance to beta-cypermethrin in 2014 and 2016. Based on the integrated pest management strategy, insecticides should be applied reasonably according to the local resistance surveillance results to control the cockroach effectively.

Key words: Blattella germanica, Insecticide resistance, Resistance dynamic