Antifeedant Effects of Citrus Limonoids Differing in A-Ring Structure on Colorado Potato Beetle (Coleoptera: Chrysomelidae) Larvae

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The antifeedant effects of three citrus limonoids (limonin, obacunone, and nomilin) which differ only in the structure of the A-ring were compared in feeding assays with fourth-instar Colorado potato beetles, Leptinotarsa decemljneata (Say). In contrast to studies with other insects, the results of choice assays showed no differences among the three limonoids in their ability to deter feeding. No-choice assays also indicated no differences among the limonoids and, along with incidental observations, suggested that all three Iimonoids acted as toxins. The changes in the A-ring represented by obacunone and nomilin may be important in enhancing deterrency against some insect species but have no effect in increasing the toxicity of limonoids against Colorado potato beetle larvae.

Document Type: Research Article

Publication date: August 1, 1991

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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