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Published in Crop Sci 15:183-184 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Selection Potential for Earworm Resistance in Two Corn Populations and Their Cross1

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

Variances and expected selection progress for reduced injury by the corn earworm [Heliothis zea (Boddie)] and for husk tightness were estimated in two corn (Zea mays L.) populations and their F1 and F3 generations. A half-sib mating design was used to test all populations during each of two successive years. Heterosis estimates for earworm injury and husk tightness were less than 5%, except for an estimate of 13.9% for husk tightness in the F3. Estimates of genetic variance showed that dominance for corn earworm resistance was of less significance than that for husk tightness.

Additive variance for earworm injury in the F3 was higher than the mean variance of the parents. This difference may be caused by factors such as multiple alleles, coupling linkages, and segregation of genes in the F3 for which alleles are fixed in one or both of the parents. On the basis of expected selection progress for the characters measured and a highly significant positive correlation between resistance to earworm injury and husk tightness, the authors suggest improvement of these populations by selecting primarily for low earworm injury, while requiring the selections to meet prescribed standards for husk tightness and yield.

Key Words: Genetic variance • Dominance • Linkage • Heliothis zea (Boddie) • Zea mays L.

1 Contribution of ARS, USDA in cooperation with the U. of Ga., Coll. of Agr. Exp. Stn., Coastal Plain Stn., Tifton, GA 31794.

2 Research geneticist and research entomologists, Southern Grain Insects Res. Lab., ARS, USDA, Tifton, GA 31794.

Received for publication May 8, 1974.




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