Sesquiterpene lactones — insect feeding deterrents in Vernonia |
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Authors: | William C Burnett Samuel B Jones Tom J Mabry William G Padolina |
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Institution: | Department of Botany, University of Georgia, Athens, GA 30602, USA;Department of Botany, University of Texas, Austin, TX 78712, USA |
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Abstract: | Larval feeding tests were run to determine the preference of six species of Lepidoptera for two species of Vernonia which produce sesquiterpene lactones and one which has lost the ability to produce these bitter principles. Significant differences between the feeding preferences of the insect species were observed. Further feeding tests were run with a Vernonia leaf powder medium to determine how interspecific chemical differences influenced these preferences. The sesquiterpene lactone, glaucolide-A, was found to reduce larval feeding when incorporated in a Vernonia powder-agar medium. The amount of insect feeding was inversely proportional to the concentration of glaucolide-A in the medium. |
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Keywords: | Diacrisia Sibine Spodoptera Trichoplusia Vernonia Vernonieae Compositae Lepidoptera sesquiterpene lactones insect resistance plant-insect interactions |
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