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2012年49 No.5
Antifeeding activity of Vitex trifolia extracts against third-instar larvae of Plutella xylostella
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Key Words：Vitex trifolia，Plutella xylostella，antifeeding activity
Abstract：
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The anti feeding activity of extracts of Vitex trifolia (L． ) leaves against the 3rd instar larvae of Plutella xylostella (L． ) was tested in alaboratory． A no-choice experiment revealed that extracts extracted with either ethyl acetate，petroleum，ether or chloroform had significant antifeedingactivity． The relative antifeeding activity of extracts obtained with each of these four solvents was，in descending order; ethyl acetate＞ petroleum ether＞ chloroform＞ethanol． A choice-experiment indicated that the AFC50 of the ethyl acetate extract was 2 520 mg·L－1 24 h after treatment
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and3240 mg·L－1after 48 h． The number ofP． xylostella larvae on Brassica oleraceavar． capitata plants could be reduced by 72. 76%three days after spraying with ethyl acetate extract．