Influence of Corn Silks on Corn Earworm Feeding Response
Abstract
A 2-year study was conducted in both the field and laboratory on the silk-feeding responses of the corn earworm, Heliothis zea (Boddie), to selected corns when the exposed silks were either left intact and/or removed. Exposed silk masses limited early earworm penetration into the ear in 1976 but not in 1978. An exception was the exposed silks of `Zapalote Chico' in which antibiosis appeared to be the overriding factor preventing penetration into the ear rather than the physical characteristics expressed in the case of the other corn entries. Significantly smaller larvae were produced on silks of `Zapalote Chico' as compared to other resistant and susceptible lines, and, in general, on all corn lines when earworms were fed silks that were 6 or more days past full silk, as compared to larvae fed fresher silks.Downloads
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