Objective To investigate the resistance of Aedes albopictus to commonly used insecticides, after control of a dengue fever outbreak in Chongqing, China, 2019, and to provide a basis for controlling mosquito-borne diseases including dengue fever and Aedes vector. Methods From May to October, 2020, Ae. albopictus mosquitoes were collected from parks or waste tire piles in 6 districts (counties) of Chongqing and were reared for 1-2 generations in laboratory, and the larval dipping method and the adult exposure tube method were used for insecticide resistance surveillance. Results Ae. albopictus larvae from each investigation site of Chongqing had varying degrees of sensitivity to commonly used insecticides, with a resistance ratio of 0.46-7.32. The resistance ratio was 0.46-4.92 for temephos and 0.82-7.32 for propoxur. Adult Ae. albopictus mosquitoes from each investigation site of Chongqing developed varying degrees of resistance to deltamethrin, permethrin, beta-cypermethrin, and lambda-cyhalothrin, with a 24-hour death rate of 5.88%-78.22%. The adult Ae. albopictus mosquitoes in the field of Wanzhou district developed suspected resistance to bendiocarb and fenitrothion, and those in the field of Dazu district developed suspected resistance to chlorpyrifos; the adult Ae. albopictus mosquitoes in the field of the remaining investigation sites were sensitive to propoxur, bendiocarb, malathion, fenitrothion, and chlorpyrifos. Conclusion Ae. albopictus adult mosquitoes from each investigation site of Chongqing develop resistance to pyrethroids, and Ae. albopictus larvae from some investigation sites develop a low level of resistance to temephos and propoxur. It is recommended to regularly monitor the resistance level and changing trend of Ae. albopictus and to select corresponding insecticide use strategies according to the insecticide resistance of Ae. albopictus at different developmental stages.
TU Tao-tian, XIAO Han-sen, MENG Feng-xia, LIU Qi-yong, LIU Xiao-bo, HE Ya-ming, JI Heng-qing
. An investigation of the insecticide resistance of Aedes vector after emergency control of a dengue fever outbreak in Chongqing， China， 2019[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(1)
: 44
-47
.
DOI: 10.11853/j.issn.1003.8280.2022.01.008
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