摘要 : The use of plant-based compounds to control insect pests is an alternative to the use of synthetic pesticides. We evaluated the repellent and antifeedant effects of <i>Cordeauxia edulis</i> Hemsley (Fabaceae) and <i>Rhododendron t... 展开 The use of plant-based compounds to control insect pests is an alternative to the use of synthetic pesticides. We evaluated the repellent and antifeedant effects of <i>Cordeauxia edulis</i> Hemsley (Fabaceae) and <i>Rhododendron tomentosum</i> Harmaja (Ericaceae) extracts against <i>Hylobius abietis</i> L. (Coleoptera: Curculionidae) and <i>Phyllodecta laticollis</i> Suffrian (Coleoptera: Chrysomelidae). Repellent properties were evaluated by monitoring responses of adult insects toward the odor from extracts or extraction solvents (controls) in a Y-tube olfactometer, and choice or no-choice feeding tests were conducted by applying extracts or extraction solvents on stems of Scots pine [<i>Pinus sylvestris</i> L. (Pinaceae)] and European aspen [<i>Populus tremula</i> L. (Salicaceae)], host plants of <i>H. abietis</i> and <i>P. laticollis</i>, respectively. Extracts of <i>R. tomentosum</i> repelled adults of both insect species effectively. However, extracts of <i>C. edulis</i> did not repel <i>H. abietis</i> although its ethyl acetate extract showed repellence against the adults of <i>P. laticollis</i>. Feeding by <i>H.abietis</i> was significantly reduced by a methanol extract of <i>C. edulis</i>, and methanol and hexane extracts of <i>R. tomentosum</i>. Feeding by the adults and larvae of <i>P. laticollis</i> was significantly reduced by extracts from both plant species. Concomitant with less feeding, larval growth was retarded by ethyl acetate extracts of both plant species. Gas chromatography-mass spectrometry analyses of the volatile components of the extracts showed that extracts from both plant species were mixtures of various terpene and non-terpene compounds, which showed quantitative and/or qualitative variations between plant species and extraction solvents. This experiment showed that extracts from both plant species effectively manipulated the orientation and/or feeding behavior of the two beetle species. Hence, they may be considered as potential alternatives to synthetic chemical pesticides.Digital Object Identifier http://dx.doi.org/10.1111/j.1570-7458.2010.01082.x 收起