A bioassay for natural insect repellents
2008
Abstract A practical bioassay for natural product insect repellents was developed and validated. The Asian tiger mosquito ( Aedes albopictus ) was used in this study. Djulis ( Chenopodium spp .), an indigenous plant from Taiwan, provided better insect repellency than neem tree ( Azadirachta indica ) oil, a well-known insect repellent. The % repellency of each test material was converted to 50% effective dosage (ED 50 ) by probit analysis for better comparison between test materials. The ED 50 for insect repellency in descending order was djulis leave extract (0.532%), neem oil (0.579%); djulis seed extract (0.930%) and sea lily ( Crinoid spp. ) (1.022%).
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