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Inheritance of Resistance to Diplodia Stalk-Rot in Corn¹

Inheritance of resistance to Diplodia zeae in eight populations of corn was studied. Generation mean analyses were used to detect the types of gene action important in host resistance to stalk-rot of corn caused by D. zeae. Six of 8 populations studied consisted of P₁, P₂, F₁, F₂ B₁, and B₂ generations. Two populations had an additional generation, a composite F₃. All plants were artificially inoculated and subsequently rated for stalk-rot development on a scale from 0 to 6.

Additive gene effects were significant for all 8 populations, dominance effects were significant for 6 populations and deviations were significant for 3 populations. It was concluded that selection among inbreds for stalk-rot resistance should be effective, but that it would probably be necessary to invoke additional breeding techniques to obtain maximum resistance in hybrid combination.

² Research Pathologist, Crops Research Division, ARS, USDA, in cooperation with (Alabama) Auburn University Agr. Exp. Station, Auburn, Alabama, (formerly Research Instructor, Department of Crop Science, North Carolina State University at Raleigh) and Research Agronomist, Crops Research Division, ARS, USDA, Raleigh, respectively.