Insecticide resistance of Aedes albopictus and Culex pipiens quinquefasciatus in Changsha City from 2022 to 2023

XIAO Shan; ZHU Caiying; LIN Bin; CHEN Jianyong; XU Mingzhong

doi:10.19821/j.1671-2781.2023.06.002

Abstract：Objective To investigate the resistance levels of Aedes albopictus and Culex pipiens quinquefasciatus to commonly used insecticides in Changsha from 2022 to 2023,and to provide scientific basis for the rational use of insecticides.Methods The test were measured using larval dip method,insect growth regulator resistance test,and the WHO tube method.Results In 2022,adult Aedes albopictus mosquitoes in Changsha City developed resistance to permethrin and deltamethrin,the 24-hour mortality rates were 79.63%and 76.64%,and developed possible resistance to beta-cypermethrin and malathion,the 24-hour mortality rates were 88.24%and 91.96%,showed sensitivity to fenitrothion and propoxur,the 24-hour mortality rates were 98.26%and 98.45%.The Aedes albopictuslarvaeshowed high resistance to pyriproxyfen and low resistance to temephos and propoxur,with resistance multiples of 51.89,7.69and 9.12,respectively.In 2023,adult mosquitoes of Culex pipiens quinquefasciatus in Changsha City developed resistance to permethrin,deltamethrin,beta-cypermethrin,and malathion,with mortality rates of 0.00%,0.97%,0.93%,21.30%,respectively,and developed possible resistance to propoxur,with mortality rates of 96.32%.Culex pipiens quinquefasciatus larvaeexhibited high resistance to deltamethrin,with resistance multiples of 54.62,exhibited moderate resistance to beta-cypermethrin,with resistance multiples of 17.63,exhibited low resistance to DDVP,with resistance multiples of 9.32.Conclusion The Aedes albopictus and Culex pipiens quinquefasciatusin Changsha showed resistance to a variety of insecticides,so scientific drug strategies should be formulated according to the resistance situation.