Transmission of Corn Earworm Resistance from Zapalote Chico to Topcross Progenies12

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Abstract
Cameron and Anderson (1966) found that the exotic corn strain ‘Zapalote Chico’ was extremely resistant to corn earworm, Heliothis zea (Boddie). Silks from this strain were shown by Bennett et al. (1967) to be resistant to earworm feeding in field tests and in laboratory tests when larvae were fed freshly excised silks. Utilizing meridic media containing lyophilized silks from Zapalote Chico and Mp319, Straub and Fairchild (1970) obtained significantly lower 8-day larval weights on the Zapalote Chico media. They hypothesized that silks from this strain contained some chemical factor that acted as a feeding deterrent or a growth inhibitor. The present study was undertaken to determine if the Zapalote Chico resistance factor could be genetically transmitted to its progenies. The resistant strain, Zapalote Chico, and the susceptible synthetic, ‘Iowa Super Stiff Stalk,’ were used as topcross tester parents and crossed on 7 single crosses encompassing a wide range in maturity for comparing the transmission of earworm resistance.

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