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Second Generation European Corn Borer Damage Relationships in Sweet Corn¹

European corn borer [Ostrinia nubilalis (Hubner)] is the most serious insect pest on sweet corn (Zea mays L.) grown for processing in the Midwest. This research was designed to evaluate diallel hybrid combinations of previously identified low- and high-damage inbreds by second-generation European corn borer following artificial infestation. During 3 years 10 low-damage and 10 high-damage inbreds were used in each of two separate diallels consisting of 45 F₁ hybrids, without parents and reciprocal crosses. While the year x genotype interactions were highly significant, it was possible to identify two inbreds from the previously identified low-damage group which consistently contributed to low damage in their progeny and two inbreds from the high-damage group which consistently contributed to high damage in their progeny. Hybrids of high-damage parents averaged earlier in maturity and tended to have fewer tillers than those in the low-damage diallel although there were seasonal differences. If the sample of fines used in this study is representative, selection procedures for additive gene action should be effective. However, the range in specific combining ability effects and the significant year x genotype interactions emphasize the importance of testing a wide range of hybrid combinations in different seasons.

Key Words: Ostrinia nubilalis Hubner • Zea mays L. • Diallel • Genotype • Combining ability • Insect damage

² Respectively, professor, Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706, and graduate research assistant, now at Iowa State Univ., Ames, IA 50011. The authors acknowledge European corn borer pupae supplied by the USDA Corn Borer Research Unit at Ankeny, IA.

Received for publication February 27, 1980.

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