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Reaction of Permutations of Maize Double Crosses to Leaf Feeding of European Corn Borers¹

We tested the 3 permutations of 12 double-cross hybrids plus all possible single crosses among 8 inbred lines for their reaction to first-brood infestation by European corn borers. Double crosses with three or more resistant lines in their pedigree had a high level of resistance. Double crosses containing two highly resistant lines had an acceptable level of resistance. The differences which occurred in double-cross permutations were primarily in hybrids composed of two resistant and two susceptible inbreds. However, the differences among permutations were small as compared to the total difference between resistant and susceptible plants. Differences between observed and predicted values of some permutations indicated that some type(s) of epistatic gene action was important in the expression of corn borer resistance.

Key Words: Ostrinia nubilalis (Hübner) • single crosses • predicted values

² Research Agronomist, Crops Research Division (present address: Agronomy Department, Mississippi State University, State College, Miss.); and Entomologist, Entomology Research Division, ARS, USDA.

Received for publication October 24, 1966.