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Incubation Period and Latent Period of Wheat for Resistance to Leptosphaeria nodorum. D. E. Stooksbury, Former Graduate Research Assistant, University of Georgia, Georgia Station, Griffin 30223-1797. J. W. Johnson, and B. M. Cunfer. Professor, Agronomy, and Professor, Plant Pathology, University of Georgia, Georgia Station, Griffin 30223-1797. Plant Dis. 71:1109-1112. Accepted for publication 24 June 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-1109.

Seven soft red winter wheat (Triticum aestivum) parents and the diallel set of hybrids among them were included in a complete diallel mating design. Parents and F1 crosses were evaluated for the inheritance of incubation period and latent period, two components of resistance to Leptosphaeria nodorum, cause of Septoria nodorum blotch. General combining ability (GCA) effects and specific combining ability (SCA) effects were highly significant for both incubation and latent period. Fitting GCA effects accounted for 54 and 46% of the corrected sums of squares among crosses. Coker 762 and Oasis had the largest GCA effects for latent period and should make excellent parental sources for resistance to L. nodorum.