Abstract
The essential oil extracts of six Malaysian plants, i.e. Curcuma longa, Zingiber officinale, Pandanus odorus, Cinnamomum zeylanicum, Syzygium aromaticum and Cymbopogon citratus, were evaluated for repellent activity against Periplaneta americana using a modification of the ‘two-cylinders’ method. Dose-dependent repellency ranging from 57.1 to 100% was exhibited by all six extracts at the lowest concentration tested (12 ppm).
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