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Published in Crop Sci 12:358-359 (1972)
© 1972 Crop Science Society of America
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Genetic Parameters for Earworm Injury in Maize Populations with Latin American Germ Plasm1

N. W. Widstrom, B. R. Wiseman and W. W. McMillian2

Genetic variances for earworm [Heliothis zea (Boddie)] injury were estimated for three composite populations of corn (Zea mays L.) with Latin American germ plasm and for a cross between two of the composites. Heterosis was weak in the hybrid population. Estimates of dominance were much less significant than those for additive genetic variance in these populations, with the possible exception of the broader genetic-based RFC population. Estimates of heritability and genetic response to selection were highest in those populations that also had the largest estimate for dominance and the highest level of earworm resistance. Prospects for successful selection within these populations are good.

Key Words: Zea mays L. • Heliothis zea (Boddie) • Additive genetic variance • Dominance • Selection • Plant resistance

1 Contribution of Plant Science Research Division and Entomology Research Division, Agricultural Research Service, USDA, in cooperation with the University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Ga. 31794.

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

Received for publication October 19, 1971.




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