Objective To understand the distribution, density, and seasonal fluctuation of Aedes albopictus and the resistance of larvae and adults to different insecticides in Zibo city, China, in order to provide a scientific basis for risk assessment, prediction, early warning, and effective prevention and control of dengue fever, and to provide a theoretical basis for scientific and rational use of insecticides. Methods The density of mosquito larvae was monitored by Breteau index (BI) and mosq-ovitrap (MOT) methods. The density of adult mosquitoes was monitored by double-layer net method. Insecticide resistance was detected by bioassays recommended by WHO, including dipping method for larvae and contact tube method for adults. Results Among mosquito larval breeding containers, bonsai and aquatic plants showed the highest container index (CI) of 36.46%. The larvae were detected by BI and MOT in late-April and mid-May, respectively, with the peaks in mid-August and late-July, and almost disappeared in late-October. The average BI of larvae was 19.98, and the highest BI was 75.00 in August. Adult mosquitoes were detected in late-June, peaked in mid-August, and disappeared in mid-October, with obvious seasonal fluctuation. The median lethal concentration (LC50) of Ae. albopictus larvae to propoxur and temephos were 3.600 0 mg/L and 0.006 0 mg/L, respectively, which were 9.89 and 3.75 times of the sensitive strain. Adult mosquitoes showed resistance to permethrin (0.4%), deltamethrin (0.03%), beta-cypermethrin (0.08%), and beta-cypermethrin (0.07%). They were suspected to be resistant to propoxur (0.05%), bendiocarb (0.2%), and fenitrothion (0.2%). They were sensitive to malathion (0.5%) and chlorpyrifos (2%). Conclusion Ae. albopictus is widely distributed and has a high density in Zibo city, which may lead to local epidemics due to imported dengue cases. In Zibo city, Ae. albopictus larvae had developed resistance to propoxur and disulphos, while adult mosquitoes showed resistance to pyrethroid insecticides. Surveillance on the density and drug resistance of Ae. albopictus should be strengthened, and insecticides should be used scientifically and reasonably to effectively prevent the spread of dengue fever.
CHENG Shuo, SUN Qi, WANG Yan-dong, ZHANG Xue-qing, JING Xiao, WANG Xue-jun
. Ecological surveillance and insecticide resistance of Aedes albopictus in Zibo city, Shandong province, China, 2020[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(6)
: 815
-819
.
DOI: 10.11853/j.issn.1003.8280.2022.06.009
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