An analysis of resistance of Blattella germanica to commonly used insecticides in Shenzhen, China
HU Jing1, LIU Yang2, ZHANG Shao-hua2, QIN Yan-min2, LIANG Zhuo-nan2
1. School of Public Health, Nanhua University, Hengyang, Hunan 425000, China; 2. Shenzhen Center for Disease Control and Prevention, Shenzhen, Guangdong 518055, China
Abstract:Objective To investigate the resistance of Blattella germanica to commonly used insecticides in ten districts of Shenzhen, China and the dynamic development rules of such insecticide resistance, and to provide a scientific basis for the drug control of cockroaches and the formulation of effective prevention and control programs. Methods According to the residual film method in Cockroach insecticide resistance monitoring program (On trial) formulated by National Study Group of Cockroach Prevention and Control, 2.5 ml of 0.05% insecticide solution was placed into a 500 ml transparent wide-mouth bottle, and the wide-mouth bottle was rolled to form a uniform drug membrane. The male adults of B. germanica were put into the bottle, and the knockdown of the test insects was observed and recorded at a certain interval. SPSS 24.0 software was used to calculate median knockdown time. Results Beta-cypermethrin showed high resistance in Longgang district, with a resistance ratio of 11.34, medium resistance in Bao'an, Guangming, and Futian districts, with resistance ratios of 8.79, 8.77, and 8.07, respectively, and low resistance in the other districts. Permethrin showed high resistance in Futian, Longhua, Bao'an, Longgang, and Luohu districts, with resistance ratios of 22.26, 13.99, 14.28, 13.01, and 10.01, respectively, medium resistance in Pingshan district, with a resistance ratio of 5.51, and low resistance in the other districts. Deltamethrin showed medium resistance in Bao'an, Longgang, and Longhua districts, with resistance ratios of 7.00, 6.39, and 6.02, respectively, and low resistance in the other districts. Cypermethrin showed high resistance in Bao'an district, with a resistance ratio of 19.65, medium resistance in Futian district, with a resistance ratio of 9.42, and low resistance in the other districts. Chlorpyrifos, acephate, and propoxur showed low resistance in all districts. Conclusion Varying degrees of resistance to pyrethroid insecticides are observed in B. germanica in Shenzhen. It is suggested to stop or restrict the use of insecticides with medium and high resistance and to use chlorpyrifos, acephate, and propoxur with low resistance. At the same time, comprehensive control measures should be taken to control and delay the development and progression of insecticide resistance in B. germanica.
胡静, 刘阳, 张韶华, 秦彦珉, 梁焯南. 广东省深圳市德国小蠊对常用杀虫剂的抗药性分析[J]. 中国媒介生物学及控制杂志, 2021, 32(1): 70-73.
HU Jing, LIU Yang, ZHANG Shao-hua, QIN Yan-min, LIANG Zhuo-nan. An analysis of resistance of Blattella germanica to commonly used insecticides in Shenzhen, China. Chines Journal of Vector Biology and Control, 2021, 32(1): 70-73.
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