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Resistance Among Some Maize Inbreds and Single Crosses to Fall Armyworm Injury¹

Analyses of fall armyworm, Spodoptera frugiperda (J. E. Smith), leaf feeding injury data for eight maize, Zea mays L., inbreds and their F₁ progeny were made to determine the kind of gene action involved in conditioning resistance. General combining ability effects were highly significant. We concluded that dominance and/or specific combining ability were relatively unimportant in conditioning resistance. Heterosis contributed substantially to the mean level of resistance among F₁ progenies. Successful selection among these lines and their progeny will depend on the accumulation of additive gene effects for resistance to fall armyworm damage. Recurrent selection based on selfed progeny performance is suggested for developing a resistant plant population.

Key Words: Fall armyworm resistance • Heterosis • Zea mays L. • Host plant resistance • Combining ability • Corn

² Research Geneticist, PSRD, and Research Entomologists, ERD, respectively, ARS, USDA, Tifton, Ga. 31794.

Received for publication October 2, 1971.