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Breeding for Resistance in Maize to First and Second Broods of the European Corn Borer¹

Resistance to first and second broods of the European corn borer [Ostrinia nubilalis (Hübner)] in maize (Zea mays L.) is not conditioned by the same genes. Our purpose was to determine if we could combine the two kinds of resistance into one genotype by a simple inbreeding and selection technique. Starting with 200 F₃ lines from B52 x Oh43, we obtained 1 F₆ inbred line slightly better than Oh43 for first-brood resistance and equal to B52 for second-brood resistance. Because several loci are involved, a backcross program may not be successful in transferring all resistance genes to other lines. A sampling of a synthetic variety, ‘BS9,’ developed by combining 10 inbred lines that among them contributed first- and second-brood resistance, showed a correlation near zero for evaluations to the 2 kinds of resistance. A recurrent selection program based on S₁ line evaluation is recommended to increase gene frequencies to both broods in a population which can then be used as a source for resistant lines.

Key Words: Zea mays L. • Ostrinia nubilalis (Hübner) • insect resistance

² Professor, Iowa State University; Entomologist, ARS, USDA, and Professor, Iowa State University; Agricultural Research Technician, ARS, USDA.

Received for publication March 12, 1974.

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