Objective To grasp the resistance levels of Aedes albopictus to commonly used insecticides and their trends in Fengxian district, Shanghai, China, and to provide a scientific basis for the protection against vectors and the prevention and control of dengue fever in the major urban activities. Methods The larval dipping method recommended by the World Health Organization was used to determine the insecticide resistance of Ae. albopictus larvae. Results In 2015, 2018, and 2019, the Ae. albopictus larvae showed varying degrees of resistance to three insecticides, temephos, deltamethrin, and beta-cypermethrin, and the resistance coefficient overall showed an upward trend first and then a downward trend. In recent 5 years, the overall level of resistance to temephos has been lower than that to deltamethrin and beta-cypermethrin, which remained at a low level from 2015 and 2018 and decreased to a sensitive level (resistance ratio 1.25) in 2019; the resistance to deltamethrin was highest in 2018, reaching a high resistance level (resistance ratio 68.75), and showing a fluctuating trend from medium to high and then to medium resistance; the resistance to beta-cypermethrin remained at a medium level from 2015 and 2018, and dropped to a low level (resistance ratio 7.00) in 2019. In 2019, the insecticides that controlled mosquito larvae were mainly organophosphates, of which the dose of temephos accounted for 33.87% of the total dose of insecticides used; the insecticides that controlled adult mosquitoes were mainly pyrethroids and carbamates, of which the doses of beta-cyfluthrin, permethrin-allethrin, and permethrin-tetramethylfluthrin accounted for 41.17%. Conclusion Aedes albopictus in Fengxian district has developed resistance to deltamethrin and beta-cypermethrin insecticides. A reasonable rotation or mixed use of insecticides should be adopted to effectively alleviate and reduce the development of insecticide resistance.
ZHANG Hai-bing, GE Bin, LIU Hong-xia, LIU Qing, YI Ke-hua, ZHANG Yu, HUANG Tao
. A trend analysis of the resistance of Aedes albopictus to commonly used insecticides in Fengxian district, Shanghai, China, 2015-2019[J]. Chinese Journal of Vector Biology and Control, 2020
, 31(2)
: 148
-151
.
DOI: 10.11853/j.issn.1003.8280.2020.02.006
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