关键词: 白纹伊蚊, 常用杀虫剂, 抗药性

Abstract: Objective To investigate resistance levels of the dengue vector adult Aedes albopictus to commonly used insecticides in Sichuan province, China, and to provide a basis for guiding the selection and use of insecticides after dengue outbreak, rapidly reducing the density of vector, and improving the control effect. Methods The larvae of Ae. albopictus were captured at different sites in the urban areas of 10 cities or prefectures in Sichuan province including Chengdu, in June, 2019, and brought them back to the laboratory for feeding. After becoming adult mosquitoes, they were tested by the contact tube method recommended by the World Health Organization, and the data obtained were analyzed according to the judgment criteria to evaluate whether they had resistance to insecticides. Results The adult mosquitoes from Chengdu, Ya'an, Leshan, Panzhihua, Nanchong, Suining, Neijiang, Zigong, Luzhou, and Guang'an were exposed to 0.40% beta-cypermethrin, 0.10% deltamethrin, 0.50% malathion, and 0.05% propoxur for 1 and 24 hours, respectively, with mortality rates of 29.00%-98.40%, 22.91%-98.85%, 33.11%-100%, and 89.91%-100%, respectively. Adult mosquitoes at most surveillance sites were resistant to beta-cypermethrin and deltamethrin; the test mosquitoes at all surveillance sites except those in Chengdu, Ya'an, and Suining were sensitive to malathion; the test mosquitoes at all surveillance sites were sensitive to propoxur. Conclusion It is suggested that in these regions, the use of pyrethroid insecticides should be stopped or reduced, while organophosphate and carbamate insecticides should be used together or alternately to reduce the development of insecticide resistance in Ae. albopictus and protect the environment.

Key words: Aedes albopictus, Commonly used insecticides, Insecticide resistance