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Growth Inhibition of Corn Ear worm (Lepidoptera: Noctuidae) Larvae Reared on Resistant Corn Silk Diets

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Laboratory studies were conducted to determine whether the growth inhibition response of com ear worm, Helicoverpa zea (Boddie), larvae on com silks is a result of a feeding deterrent or other factors. Neonates and 4th and 5th instars were fed either pinto bean diet (control), a mixture of silks of 'Stowell's Evergreen' (susceptible), or 'Zapalote Chico 2451# P(C3)' (resistant) com. The silks of Zapalote Chico inhibited growth, extended development time, and reduced weight of pupae when neonate and 4th instars were tested. Both consumption and amount of feces were less for neonates fed resistant silk diets, but not for 4th and 5th instars. Consumption and amount of feces excreted by 4th and 5th instars on both resistant and susceptible silk diets were greater than that of the pinto bean diet. The amount of protein in the feces excreted by 4th and 5th instars reared on resistant silk diets was substantially more than the amount of protein in the feces excreted by larvae reared on control diets. The percentage of protein: feces was substantially higher for Zapalote Chico (91.5%) than for Stowell's Evergreen, the susceptible entry (75.1%). The growth inhibition factor in resistant silks is likely caused by an antinutritive factor causing the larvae to excrete large amounts of protein.

Document Type: Research Article

Publication date: August 1, 1995

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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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