Eficácia do piretróide sintético alfametrina no controle de Rhipicephalus sanguineus em cães

Abstract

The objective of this study was to evaluate the efficacy of the synthetic pyrethroid alphamethrin in the control of Rhipicephalus sanguineus in dogs. In vitro tests with filter paper was done to nonengorged larvae, engorged larvae, nonengorged nymphs, engorged nymphs and nonengorged adults of R. sanguineus, given respectively a LC 50 of 3,63;4,79;5,87;10,01 and 11,19 ppm and a LC 90 respectively of 13,17; 17,65; 29,37; 37,32 and 42,99 ppm. Different concentrations of alphamethrin was used in engorged females of R. sanguineus and the concentration of 300 ppm showed the most Reproductive Efficiency percentual (ER) (100%). In vivo tests in six dogs artificially infested with 500 nonengorged larvae, 100 nonengorged nymphs and 30 non engorged adults of R. sanguineus, given 86,2; 100 and 100% of mean efficacy respectively to larvae, nymphs and adults.

Acaricidal efficacy of thymol on engorged nymphs and females of Rhipicephalus sanguineus (Latreille, 1808) (Acari: Ixodidae)

“…Bittencourt (1987) evaluated the efficacy of some synthetic pyrethroids on different stages of Amblyomma cajennense and concluded that adults were more resistant than the immature ones. It was also observed by Sant'anna et al (2002), who reported that R. sanguineus adults were more resistant to different concentrations of alphamethrin, comparing to larvae and nymphs. In relation to vegetable origin products, Ribeiro et al (2008) evaluated the acaricide effect of hexane extract of Calea serrata and attested that B. microplus larvae are more susceptible than engorged females.…”