Repellency effect of white flesh Citrus grandis Osbeck fruit peel extracts against Aedes aegypti (Linn.) Mosquitoes

摘要

In many parts of the world, natural plant products have been traditionally used to repel mosquitoes. In this study, various Citrus grandis's fruit peel extracts ((hexane, ethyl acetate, methanol and essential oil) have been tested to determine its repellency effect against ovipositing female and blood hungry female Aedes aegypti mosquitoes. The finding showed that oviposition activity by gravid female mosquitoes was successfully deterred by ethyl acetate extract at 10 ppm. In another study, pure essential oil effectively repelled female Ae. aegypti mosquitoes from attacking the bait in modified tunnel test. In addition, animal model applied with 20% essential oil showed good protection rate (94.7%). These results indicated that Citrus grandis's fruit peel extracts have repellency effect on female Ae. aegypti mosquitoes.