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Interaction of Diet Ingredients with Levels of Silk of a Corn Genotype Resistant to Com Earworm (Lepidoptera: Noctuidae)

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Abstract:

A series of experiments was conducted to determine the effects of addition of varying levels of silk resistance, formalin, ascorbic acid, and yeast to the CSM (cornsoy- milk) or modified pinto bean diet on weight of corn earworm larvae, Helicoverpa zea (Boddie). Interactions were found among weight of larvae that were fed on CSM or pinto bean diets with or without formalin, varying levels of resistance, and varying concentrations of ascorbic acid or yeast. In all cases, the larvae that were fed on regular diets with formalin weighed significantly more than those that fed on the same diets without formalin. The oxidative process of the resistant silks was enhanced in the silk diets without formalin and delayed in silk diets as the concentration of ascorbic acid was increased. Ascorbic acid did not generally affect weight of larvae that fed on CSM diets but caused larvae to be larger when they fed on bean diet with increased ascorbic acid. Larger larvae were also produced as concentration of ascorbic acid increased in the silk diets. Increasing concentration of yeast promoted growth of larvae that fed on silk diets of regular CSM or pinto bean. Finally, diet ingredients interacted with levels of resistance. Therefore, care must be taken with these types of assays to assure that the diets are properly characterized (i.e., components identified). Comparisons of data over more than one assay should be interpreted carefully.

Document Type: Research Article

Publication date: August 1, 1993

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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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