Evaluation location: Colorado, United States
The 1998 leaf spot epidemic started strong and progressed rather slowly, but eventually became more severe by late August. We had a period of about one month right after inoculation, inwhich we had relatively high evening temperatures, which helped disease development. Ananalysis of variance (PROC ANOVA - SAS) on the disease indices (visual evaluation scores)determined that there were significant differences among entries (P=0.05) on all three dates. A tour third evaluation, means of the resistant and susceptible internal controls were 3.2 and 5.3(scale of 0-10), respectively, across the nursery. In 1997 (September 8), these means were 3.7and 7.3, respectively. Means of contributor lines on September 8 ranged from 2.5-8.0, comparedwith 4.3-8.3 in the severe epidemic of 1997