Control of mosquito vectors of tropical infectious diseases: (3) susceptibility of Aedes aegypti to pyrethroid and mosquito coils
Autor(es): Katsuda, Y.; Leemingsawat, S.; Thongrangkiat, S.; Prummonkol, S.; Samung, Y.; Kanzaki, T.; Watanabe, T.
Resumo: We collected 11 groups of Aedes aegypti mosquitoes from various locations of Thailand. After rearing in the laboratory, the colonies were tested for KT sub(50) values to dl,d-T80-allethrin 0.5% mosquito coils in a 25 m super(3) room semi-field test and KD sub(50) and LD sub(50) values to dl,d-T80-allethrin by a topical application method. Two groups of mosquitoes were susceptible to allethrin similar to a SS (known allethrin sensitive) group, and other 9 groups showed various levels of lower susceptibility to allethrin; of these 6 had susceptibilities similar to a BS (known allethrin resistant) group with extremely low susceptibility, while the remaining 3 groups had susceptibilities to allethrin between the SS and BS groups. The KD sub(50) values with the topical application were found to correlate highly with the KT sub(50) values in the 25 m super(3) room semi-field test, providing a useful test method for insect susceptibility evaluation. The allethrin mosquito coils, even at higher concentrations, had no activity against the 6 decreased susceptibility groups, similar to the BS group. With the 25 m super(3) room semi-field test, mosquito coils with d,d-T-prallethrin at concentrations of 0.1 to 0.15% plus a synergist and those with methoxymethyl-tetrafluorobenzyl tetramethylcyclopropane carboxylate (K-3050) at a concentration of 0.1% plus a synergist were found to be highly effective against these mosquito groups. These two pyrethroids had smaller KD sub(50) and LD sub(50) values for topical application, and were more effective than dl,d-T80-allethrin, having the potential to control Ae. aegypti mosquitoes with low allethrin susceptibility.
Palavras-Chave: Allethrin; Animals; Aedes; Insect vectors; Insecticides; Mosquito control - methods; Pyrethrins
Imprenta: Southeast Asian Journal of Tropical Medicine & Public Health, v. 40, n. 5, 929-936, 2009.
Descritores: Aedes aegypti - Infectious diseases ; Aedes aegypti - Transmission ; Aedes aegypti - Public health
Data de publicação: 2009
