Objective To investigate the susceptibility of Blattella germanica to commonly used insecticides and optimize future application of insecticides. Methods The surface contact method was used, calculating the medium knock-down time(KT50) and obtaining resistance ratios by comparing with susceptible strain from 2015 to 2016. Results The resistance index of field-collected strains of B. germanica to beta-cypermethrin, deltamethrin, cypermethrin, acephate, DDVP, ehlorpyrifos, and propoxur were 13.76-32.93, 5.26-15.25, 4.81-21.02, 1.01-2.11, 1.05-7.38, 1.00-1.20, and 1.02-2.12. The average mortality of B. germanica in different areas of Chongqing after 72 h of contacting to acephate, ehlorpyrifos, DDVP, deltamethrin, cypermethrin, propoxur, and beta-cypermethrin were 100%, 100%, 94.0%, 92.0%, 81.0%, 79.0% and 78.0%. Conclusion Field collected strains of B. germanica in Chongqing have already developed different resistance to seven kinds of insecticides. Insecticides should be applied strategically to manage the insecticide resistance of B. germanica effectively.
TU Tao-tian, JI Heng-qing, TAO Xiao-ying, LUO Chao, YANG Xue-fan, SHAO Zheng-rong, LIU Yi-ping, FENG Shao-quan, HE Ya-ming
. Resistance of Blattella germanica to commonly used insecticides in Chongqing[J]. Chinese Journal of Vector Biology and Control, 2017
, 28(3)
: 226
-229
.
DOI: 10.11853/j.issn.1003.8280.2017.03.007
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