Antifeedant and toxic effects of drimanes on Colorado potato beetle larvae |
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Authors: | G.J.Z. Gols J.J.A. Loon L. Messchendorp |
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Affiliation: | (1) Department of Entomology, Agricultural University, P.O. Box 8031, 6700 EH Wageningen, The Netherlands |
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Abstract: | Among the drimane compounds tested, the dialdehydes polygodial and warburganal were the most active as antifeedants against Colorado potato beetle larvae, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae), in a dual-choice assay with potato, Solanum tuberosum L., leaf discs. Lactones were less effective. Direct observations showed that decreased feeding on leaf discs treated with polygodial and warburganal was accompanied by increased locomotry activity. Topical application of these two compounds on the insect's cuticle decreased food intake of untreated leaf discs, indicating that besides deterrent effects, toxic properties of these molecules influence feeding behaviour. |
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Keywords: | antifeedant Colorado potato beetle drimane feeding behaviour Leptinotarsa decemlineata |
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