Possible Mechanisms of Resistance of Dent Corn to the Corn Earworm1,2,3

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Studies of antibiosis in which a diet of reconstituted lyophilized silk powder was used showed no increase in larval mortality of the corn earworm, Heliothis zea (Boddie) , when a resistant single cross of dent corn was compared with a susceptible cross. Larval survival was the same on the diet of reconstituted powders and the artificial diet. The results tended to rule out oviposition preference and lethal silk factors as mechanisms of field resistance in the 3 single crosses (resistant, intermediate, and susceptible). A differential developmental period was apparent, which fact supports the possibility of the presence of either a feeding inhibitor, a feeding deterrent, or a growth inhibitor, or a combination of these substances, in the silks of the resistant cross.

Document Type: Research Article

Publication date: February 1, 1967

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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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