Submitted to: Uniform Regional Scab Nursery for Spring Wheat Parents
Publication Type: Other
Publication Acceptance Date: February 14, 2002
Publication Date: N/A
Technical Abstract: The Uniform Regional Scab Nursery for Spring Wheat Parents was grown for the seventh year in 2001. Seven locations were included in the nursery, including Ames, Iowa, Brookings, South Dakota, St. Paul and Crookston, MN, Prosper and Langdon, ND, and Glenlea, Manitoba, Canada. The 45 entries included in the nursery in 2001 were contributed by the University of Minnesota, North Dakota State University, South Dakota State University, Agriculture and Agri-Food Canada, Western Plant Breeders, and Agripro. A core set of traits evaluated at all locations included incidence of scab, disease severity, and disease index. Additionally, several locations provided post-harvest evaluation data including visual scabby kernel ratings (VSK), and grain DON concentration. Disease pressure varied greatly between locations. Extremely light disease pressure was observed at Ames, while at the other locations mean disease incidence ranged from a low of 58.5% for Langdon to a high of 99.9% at Brookings. Mean location severities ranged from 8% at Langdon to 63.3% at Brookings, while mean disease index ranged from 6% at Langdon to 63.3% at Brookings. Mean VSK ranged from 15.2% at the St. Paul location to 63% at Brookings. Mean location DON concentrations ranged from 4.7 ppm at Prosper, to 11.2 ppm at Crookston. Correlation coefficients were calculated between disease index, VSK, and DON, using overall means calculated from the three locations at which each of these parameters was measured. The correlations among these parameters were in each instance positive and significant. The correlation between disease index and VSK was 0.79, while disease index and DON exhibited a correlation of 0.66. Lastly, VSK and DON also exhibited a significant correlation of 0.76.