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Interaction Between Linear Furanocoumarins Found in Celery and a Commercial Bacillus thuringiensis Formulation on Spodoptera exigua (Lepidoptera: Noctuidae) Larval Feeding Behavior

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Abstract:

The effect of linear furanocoumarins and Bacillus thuringiensis subsp. aizawai toxins on feeding behavior of beet armyworm, Spodoptera exigua (Hübner), larvae was quantified by giving larvae a choice between a control diet and a treated diet (diets contained linear furanocoumarins, B. thuringiensis, or linear furanocoumarins plus B. thuringiensis). Linear furanocoumarins were tested at concentrations found in the outer leaves of celery, Apium graveolens L., plants. Diet consumption and diet preference were quantified by recording the position of the larvae twice daily for 4 d and analyzed using analysis of variance and loglinear models of a 2 X 2 factorial with B. thuringiensis and linear furanocoumarins as main effects. Both main effects and their interaction were significant for diet consumption and preference data. The interaction between these 2 factors on larval diet preference indicated a mildly antagonistic effect causing increased deterrence and reduced diet consumption by S. exigua larvae; however, by not as much as predicted if B. thuringiensis and linear furanocoumarins acted independently. These laboratory results document the combined effect of secondary plant compounds and an entomopathogen on larval behavior. Our results indicate the importance of considering the behavioral ecology of insect herbivores in estimating the compatibility of secondary plant compounds and entomopathogens for the development of integrated pest management programs.

Document Type: Research Article

Publication date: August 1, 1997

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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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