Objective To analyze the resistance of Blattella germanica to commonly used insecticides in Wuxi, Jiangsu province, China in the past 10 years. Methods Every two years from 2010 to 2018, B. germanica was captured by electric suction device and mechanic trapping devices in farmer's markets, restaurants, and food trading centers in Wuxi. Captured cockroaches were brought back to the laboratory, reared for one generation, and insecticide resistance was measured by the residual film method. Results The resistance ratio (RR) of B. germanica to beta-cypermethrin was 8.25 (2010), 9.94 (2012), 5.78 (2014), 12.39 (2016), and 6.06 (2018). The RR to deltamethrin was 14.02 (2012), 6.27 (2014), 16.75 (2016), and 10.79 (2018). The RR to propoxur was 1.75 (2010), 1.48 (2012), 1.32 (2014), 2.53 (2016), and 1.24 (2018). The RR to acephate was 2.14 (2010), 1.31 (2012), 1.01 (2014), 1.03 (2016), and 0.76 (2018). The RR to chlorpyrifos was 0.91 (2014), 2.09 (2016), and 0.39 (2018). Conclusion The resistance of B. germanica to beta-cypermethrin and deltamethrin increased from 2010 to 2018 in Wuxi, with medium to high levels of resistance; the resistance to propoxur, acephate, and chlorpyrifos decreased slowly and showed overall sensitive to low levels of resistance.
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