TRIAL DESCRIPTION AND SUMMARY The 1999 Uniform Regional Hard Red Spring Wheat Performance Nursery was planted at 19 locations and was harvested at all locations in Minnesota, South Dakota, Montana (one location not reporting), Wyoming, Washington, and Canada but one location was not harvested in North Dakota because of severe hail damage (Table 1). The nursery contained 26 entries and 5 checks. Trials were conducted as randomized complete blocks with three replicates. Yield data obtained from Manitoba, Canada were not used in any of the over location averages nor in the stability parameter analysis because of water damage to the plots. Data from each of 17 locations are given in Tables 2-1 to 2-17. The highest average yielding location was Powell, WY, with 80 bu/A and the lowest yielding location was 18 bu/A at Prosper, North Dakota. The average yield of 16 locations combined was 48 bu/A, with N96-0144, SD3348, N96-0060 and SD8119 in the first LSD unit. SD3414 was earliest to head at 23 days after June 1, while FA997-703 was latest to head at 31 days. The entries within the first LSD unit for test weight were ND726, SD3345, and ND721. Data for experimentals and checks grown for one year are in Table 3-1 and for two years are given in Table 3-2. Stability parameters for entries in 1999 are given in Table 3-3. A lower b value indicates less responsiveness to changing environments for yield. A high Msq indicates lower predictability for yield and should be a warning that individual locations caused major deviation from expected performance caused by either disease or agronomic problems. Adult plant field reactions to stem and leaf rust are shown in Tables 4-1 through 4-2. Scab reactions from field inoculation in South Dakota and Minnesota are given in Table 4-3, 4-4, and 4-5.