Objective To investigate the resistance level of Aedes aegypti to six commonly used insecticides in Gengma county, Yunnan province. Methods Pupale or eggs of Ae. aegypti were collected in Gengma county of Lincang city and were reared in laboratory to the first generation. The susceptibility of Ae. aegypti to six insecticides were tested by bioassay method. The resistance level was determined by adjusted mortality. Results Aedes aegypti were exposed to 0.03% cyfluthrin, 0.25% permethrin, 0.8% alpha cypermethrin, 0.25% fenitrothion, 0.8% malathion, 0.1% propoxur for 1 h, the knockdown rate was 10.09%, 24.52%, 100%, 90.72%, 100%, and 100%. The mortality after 24 h was 10.09%, 41.94%, 64.17%, 100%, 100%, and 100%. The KT50 was 9.70, 8.59, 0.47, 5.45, 3.55, and 0.55 accordingly. The test subjects were resistant to cyfluthrin, permethrin, alpha cypermethrin but remained susceptible to fenitrothion, malathion, and propoxur. Conclusion Aedes aegypti in Gengma county, Yunnan province showed concurrent resistant to cyfluthrin, permethrin and alpha cypermethrin. Therefore, the control strategy against Ae. aegypti by insecticides should be reevaluated accordingly in the study area.
WANG Jian-yu, LAN Xue-mei, YANG Rui, JIANG Jin-yong, LI Hua-chang, DENG Wei
. Study on the resistance of Aedes aegypti to six common insecticides in Gengma county, Yunnan province[J]. Chinese Journal of Vector Biology and Control, 2017
, 28(5)
: 444
-446
.
DOI: 10.11853/j.issn.1003.8280.2017.05.008
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