1996 Uniform Regional Scab Nursery For Spring
                                Wheat Parents
 
 The Uniform Regional Scab Nursery was grown for the second time in 1996.
 The nursery was grown in North Dakota, South Dakota, Minnesota and Manitoba
 with a total of 6 locations. All locations (except Brookings, SD natural)
 used irrigation or misting systems for enhancing disease infection.
 Inoculation was conducted by spraying the heads with conidia spore
 suspension (5 x 104- 1 x 105 spores/ML), and/or scattering infected kernel
 and natural infection.
 
 Visual head symptoms of scab infection and/or spread were evaluated at all
 locations, and percent tombstone kernel was assessed by either counting
 (Prosper, Manitoba) or rating, based on a standard set, (Brookings, St.
 Paul, Morris) after harvest. Late heading or poor germination were
 encountered with ATA 81 and the durum entries D 87240, D 901155 and D 91103
 at several locations. No disease data was available for entries MT 9311, MT
 9410, MT 9433, at the Manitoba location. Thus, the data set was not
 complete across all locations.
 
 Entries were planted in a single row plots using RCBD with three
 replicates. Visual head symptoms of number of heads per plot were assessed,
 and the mean value represent the plot disease data.
 
 Entries were divided into three groups: 1) Asian group- includes all
 entries with a Asian resistant source in their parentage; 2) Other group-
 no Asian resistant source in their parentage; and 3) Durum group. This
 grouping may allow readers a condensed evaluation of performance of the
 entries in relation to their resistant sources.
 
 Each location's data are presented in separate tables. Combined tables of
 head symptoms and kernel evaluation are also included.
 
 In general, entries varied in their performance across locations. All
 location means of disease severity and percent tombstone kernel of Asian
 group are lower than those of other group. Several lines in the Asian group
 did relatively well at all locations, including such as ND 2710, ND 2713,
 ND 2736, ND 2763, ND 2764, BacUp and MN 94351. Correlation coefficient was
 high (0.82) between severity and mean percent tombstone kernel in 1996, in
 contrast to the very low relationship encountered in 1995.
 
 Robert Busch, USDA-ARS, Plant Science Unit- Coordinator
 
 Hong Ma, Department of Plant Pathology, University of Minnesota (Data
 analysis and compilation)
 
 Gary Linkert, Department of Agronomy, University of Minnesota