Susceptibility of adult field strains of Aedes aegypti and Aedes albopictus in Singapore to pirimiphos-methyl and permethrin.
The susceptibilities of field strains (Fl) of Aedes aegypti and Ae. albopictus adult females to pirimiphos-methyl and permethrin were investigated and compared with a susceptible laboratory strain (S) by using a filter paper (12 x 15 cm) impregnation method. The resistance ratio between the 50% lethal concentration values (RR50) of the Fl and the S strains shows that the RR50 of Fl Ae. aegypti for pirimiphos-methyl was 1.5 and the RR50 of Fl Ae. aegypti for permethrin was 12.9. The RR50 of Fl Ae. albopictus for pirimiphos-methyl was 1.4, and that for permethrin was 1.8. This indicates that the field strain Ae. aegypti, but not Ae. albopictus, has developed resistance to permethrin. However, both species are still susceptible to pirimiphos-methyl. Therefore, control with pirimiphos-methyl will still be effective.
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Ministry of the Environment, Vector Control and Research Department, Singapore.
Yatiman
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Gek
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D000330:Aedes; D000818:Animals; D007305:Insecticide Resistance; D007306:Insecticides; D009946:Organothiophosphorus Compounds; D026023:Permethrin
D007306:Insecticides; D009946:Organothiophosphorus Compounds; C014153:pirimiphos methyl; D026023:Permethrin