TRIAL DESCRIPTION AND SUMMARY The 1988 Uniform Regional Hard Red Spring Wheat Performance Nursery (URHRSWPN) was planted at 23 locations and harvested at all 23 locations in Minnesota, North Dakota, South Dakota, Montana, Idaho, Wyoming, Wisconsin, Washington, Nebraska, and Canada (Table 1). The nursery contained 30 entries, 5 checks (4 tall, 1 semidwarf), and 25 experimentals (7 talls and 8 semidwarfs). Yield data obtained from Morris, Langdon, Dickinson, Minot, Powell, Madison, Pullman, Mead, and Winnipeg were not used in the overall average nor the stability parameter analysis. Data from 23 stations are given in Tables 2-1 to 2-24. For entries grown at the stations, the highest average yield was 82.9 bu/A at Aberdeen, Idaho while the lowest average yield was 4.5 bu/A at Williston, North Dakota. Entry SD3005 was earliest to head and averaged 9 days after June 1 closely followed by SD2980 and SD2999 at 10 days while Marquis and Era were latest at 17 days (Table 2-24). The average yield and bushel weight data for 1988, 1987-88, and 1986-88 are shown in Table 3-1. Four wheats exceeded Stoa, the highest yielding check, and only four exceeded Butte 86, the earliest heading check. WA7493, HS85-674, WA7494, and ND618 were the highest yielding entries in 1988. Stoa, ND626, and MN82354 were highest yielding in 1987-88, while ND626 and MN82354 were highest yielding in 1986-88. Three entries exceeded 60 lb/bu in 1988, SD2980, FA984-384, and ND650. The highest test weight lines in 1987-88 were FA984-384 and SD2980, while SD2980 was highest from 1986-88. Stability parameters for entries in 1988 and percent of times the line appeared in the top five entries at each location are given in Table 3-2. Entries with the greatest deviations from regression were MN85328, SD3005, and HS85-476. Stoa and SD2980 appeared in the top five 50% of the time while WA7493 appeared 35% of the time. Greenhouse seedling and adult plant field reactions to stem and leaf rust are shown in Tables 4-1 to 4-3. Adult leaf spot reaction are given in Table 4-4.