Resistance of adult Culex quinquefasciatus and Musca domestica to commonly used insecticides in Dazu District,Chongqing,2023
[Objective]To determine the resistance of adult Culex quinquefasciatus and Musca domestica to commonly used insecticides in Dazhu District of Chongqing in 2023,and provide scientific evidence for rational use of hygienic insecticides.[Methods]Drug resistance was determined by using adult mosquito contact tube method and adult fly drop method.[Results]In 2023,the 24-hour mortality rate of adult Culex quinquefasciatus in Dazu District,Chongqing,against permethrin(0.25%),beta-cypermethrin(0.025%),deltamethrin(0.025%),malathion(5%)and propoxur(0.1%)was 37.35%,21.92%,28.33%,96.43%,and 95.38%,respectively.The median lethal dose(LD50)value of female adult Musca domestica against beta-cypermethrin(95.8%),chlorpyrifos(97%),deltamethrin(90%)and dichlorvos(95%)was 2.572 µg,0.329 µg,0.406 µg,and 0.492 µg,respectively,with resistance of 829.68,7.65,53.42,and 46.42 folds to the above tested insecticides.[Conclusion]Adult Culex quinquefasciatus and Musca domestica in Dazu District show various degrees of resistance to commonly used insecticides.It warrants suspending the insecticides with high resistance,whereas mixedly and alternatively administering the insecticides with possible resistance and low resistance.Additionally,we should continue to monitor the resistance and guide the rational use of insecticides.
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