Possible Mechanisms of Resistance of Dent Corn to the Corn Earworma123

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Abstract
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.

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