Repellent and adulticide efficacy of a combination containing 10% imidacloprid and 50% permethrin against <Emphasis Type="Italic">Aedes aegypti</Emphasis> mosquitoes on dogs

This study was conducted to assess the repellent and adulticide efficacy of the combination containing 10% imidacloprid and 50% permethrin against Aedes aegypti mosquitoes on dogs. Blood-feeding success rates of the mosquitoes that were exposed to the treated dogs were 4.9 and 4.4% on days 3 and 7 post the combination application (PCA), respectively, and blood-feeding success rates increased to 6.3, 12.8, and 24.5% on days 14, 21, and 28 PCA, respectively. Blood-feeding success rates between the mosquitoes that were exposed to the treated and untreated control dogs on days 3, 7, 14, and 21 PCA were significantly different. All mosquitoes that were exposed to the treated dogs on day 3 PCA died, and mortality rates decreased to 97.1, 77.8, 40.4, and 2.1% on days 7, 14, 21, and 28 PCA, respectively. Mortality rates between the mosquitoes that were exposed to the treated and untreated control dogs on days 3, 7, 14, and 21 PCA were significantly different. This study suggested that this combination can be used to repel and kill mosquitoes on dogs; however, the application of this insecticide combination on dogs needs to be repeated every 3–4 weeks.