Resistance of Aedes albopictus to commonly used insecticides in Jinshan District,Shanghai
Objective To investigate the resistance level of Aedes albopictus to commonly used insecticides in Jinshan District,Shanghai,to provide a reference for standardizing the use of insecticides.Methods The larval dipping test was used to detect the resistance of Ae.Albopictus larvae to five kinds of insecticides,the SPSS 18.0 software was utilized to calculate the toxic regression equation and the median lethal concentration(LC50)of insecticides on the larvae.The resistance level was determined by evaluating the 24-hour mortality of adult Ae.Albopictus exposed to diagnostic doses of commonly used insecticides with the adult mosquito contact tube method.Results In 2018 and 2019,Ae.Albopictus larvae in the Jinshan District of Shanghai displayed moderate and high resistance to beta-cypermethrin,with resistance ratios of 25.03 and 65.96 folds respectively;high resistance to deltamethrin,with resistance ratios of 57.25 and 211.75 folds respectively;high resistance to permethrin,with resistance ratios of 46.17 and 243.36 folds.In 2018,2019,2021,and 2023,they showed moderate to high resistance to temephos with resistance ratios of 19.55,23.94,53.48,and 22.12 folds respectively.In 2021 and 2023,moderate resistance to fenitrothion was observed,with resistance ratios of 30.04 and 12.54 folds respectively.Adult Ae.Albopictus adults exhibited resistance to 0.03％deltamethrin,0.07％lambda-cyhalothrin,0.4％permethrin,and 0.08％beta-cypermethrin,with mortality rates ranging from 17.20％to 49.67％in 2021 and 2023.Potential resistance was observed to 0.7％lambda-cyhalothrin and 0.2％fenitrothion,with mortalities of 97.48％and 83.74％respectively.Sensitivity was noted to 0.05％propoxur with a mortality rate of 100.00％.Conclusions Ae.Albopictus in the Jinshan District,Shanghai,has developed varying resistance levels to different types of insecticides,including pyrethroids and organophosphates.It is recommended to strengthen the dynamic monitoring of the resistance of Ae.Albopictus and implement comprehensive prevention and control measures with a focus on environmental management,scientifically and rationally selecting hygienic insecticides to delay and mitigate the emergence of resistance.
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