Resistance monitoring of Aedes albopictus to six insecticides in Qixian county,Kaifeng city,2019-2023
Objective To master the resistance of Aedes albopictus to permethrin,deltamethrin,beta-cypermethrin,propoxur,temephos and Bacillus thuringiensis subsp.israelensis(Bti)in Qixian county,Kaifeng city,and guide scientific use of insecticides for the control of Aedes albopictus,the vector of dengue fever.Methods From 2019 to 2023,the larvae of Aedes albopictus were collected biennially from different directions in Qixian county and selected at the end of the third or the beginning of the fourth instar of Aedes albopictus.The resistance level of Aedes albopictus was measured by the larvae dipping method.Results In 2019,2021 and 2023,in Qixian county,the resistance ratios of Aedes albopictus larvae to permethrin were 33.76,2.44 and 4.38,respectively,with the resistance level of moderate resistance-sensitivity-low resistance;the resistance ratios of Aedes albopictus larvae to deltamethrin were 19.49,8.19 and 7.34,respectively,with the resistance level from moderate resistance to low resistance;the resistance ratios of Aedes albopictus larvae to beta-cypermethrin were 3.32,2.52 and 10.31,respectively,with the resistance level of low resistance-sensitivity-moderate resistance;the resistance ratios of Aedes albopictus larvae to propoxur were 2.43,4.35 and 6.06,respectively,with the resistance level from sensitivity to low resistance;the resistance ratios of Aedes albopictus larvae to temephos were 1.81,1.88 and 2.56,respectively,and the resistance ratios of Aedes albopictus larvae to Bti were 0.23,0.07 and 0.05,respectively,with the resistance levels of sensitivity for both temephos and Bti.Conclusions Aedes albopictus has developed different levels of resistance to permethrin,deltamethrin,beta-cypermethrin and propoxur,and is sensitive to temephos and Bti in Qixian county,Kaifeng city.It is suggested to use hygienic insecticides scientifically and rationally so as to delay the development of insecticide resistance.
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