Control of mosquito vectors of tropical infectious diseases: (2) pyrethroid susceptibility of Aedes aegypti (L.) collected from different sites in Thailand
Autor(es): Katsuda, Yoshio; Leemingsawat, Somjai; Thongrungkiat, Supatra; Prummonkol, Samreng; Samung, Yudthana; Kanzaki, Tsutomu; Watanabe, Tomoe; Kahara, Tomoko
Resumo: Four strains (SS, BS, A and B) of Aedes aegypti collected from different sites in Bangkok and at different times were examined for their pyrethroid susceptibility. Mosquito coils containing dl, d-T80-allethrin, d, d-T-prallothrin and methoxymethyl-tetrafluorobenzyl tetramethyl-cyclopropanecarboxylate (K-3050) with or without a synergist were tested by the 25 m(3) semi-field test method. One strain (SS) was the most susceptible with KT50 values of about <30 minutes for all mosquito coils, while the other three strains (BS, A and B) were found to be around 10 to 20 times more tolerant to pyrethroids than the SS strain. A similar tendency for the pyrethroid susceptibility of the four strains was obtained with tests by topical application method. In field efficacy tests, mosquito coils with d, d-T-prallethrin 0.20% plus N-(2-ethyl hexyl)bicycle- [2,2, 1]- hept-5- ene-2,3-dicarboxyimide as a synergist exhibited a repellent effect of about 85%, while those with K-3050 0.10% plus the synergist exhibited a greater repellent effect of about 90%. In contrast, the repellent effect of commercial dl, d-T80-allethrin 0.20% coils was as low as about 50%. The d, d-T-prallethrin and K-3050 coils with the synergist were confirmed to be highly effective in repelling Ae. aegypti.
Imprenta: Southeast Asian Journal of Tropical Medicine and Public Health, v. 39, n. 2, p. 229-234, 2008
Descritores: Aedes aegypti - Biochemistry ; Aedes aegypti - Infectious diseases ; Aedes aegypti - Repellent ; Aedes aegypti - Epidemiology ; Aedes aegypti - Public health
Data de publicação: 2008
