ABSTRACT
Thirteen cultivars were evaluated in the greenhouse and field for reaction to Stagonospora nodorum leaf and glume blotch. Coker 9663 exhibited consistent resistance across both greenhouse and field tests. In field plots, all cultivars tested had relatively high percentages of S. nodorum in harvested seed. Strong correlations between reactions from greenhouse and inoculated plots indicated that resistant and susceptible genotypes could be identified using either procedure. The amount of S. nodorum resistance expressed depended on the host organ assessed, but Coker 9663, and OH708 in inoculated field plots, had both leaf and glume blotch resistance. Cultivars reacted similarly in inoculated and naturally infested plots based on mean leaf or glume blotch severity, whereas severity was inconsistent between the greenhouse and naturally infested plots. Results indicated that leaf and glume blotch resistance could be identified in naturally infested plots in epidemic years, but that cultivar reactions should be confirmed in inoculated plots or greenhouse tests due to possible interference from other leaf blotch pathogens.
