TRIAL DESCRIPTION AND SUMMARY The 1986 Uniform Regional Hard Red Spring Wheat Performance Nursery (URHRSWPN) was planted at 22 locations and harvested at 21 locations in Minnesota, North Dakota, South Dakota, Montana, Idaho, Wyoming, Wisconsin, Washington, Nebraska, and Canada (Table 1). The nursery contained 31 entries, 5 checks (4 tall, 1 semidwarf), and 26 experimentals (6 talls and 20 semidwarfs). Yield data obtained from Mead and Selby were not used in the overall average. Data from 21 stations are given in Tables 2-1 to 2-22. For entries grown at the stations, the highest average yield was 73 bu/A at Aberdeen, Idaho while the lowest average yield was 26 bu/A at Madison, Wisconsin. Entries SD2980 and SD2990 headed 22 days after June I while Marquis headed 30 days after June 1. The average yield and bushel weight data f or 1986, 1985-86, and 1984-86 are shown in Table 3-1. Seventeen wheats exceeded Era, the highest yielding check, and 19 exceeded Butte, the earliest heading check. HS82-175, SD2956, ND606, and MN82047 were the highest yielding entries in 1985-86 while SD2956 was the highest yielding entry in 1984-86. One entry exceeded 60 lb/bu in 1986, SD2980. The highest test weight lines in 1985-86 were HS82-175, SD2962, Butte, SD2956 and MN82047 and in 1984-86 was Butte. Stability parameters for entries in 1986 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 Marquis, MT8304, and C982-324. HS82-175 and SD2961 appeared in the top 5 60% of the time. SD2956 and ND606 appeared in the top 5 about 40% of the time. Greenhouse seedling and adult field reactions to stem and leaf rust are shown in Tables 4-1 to 4-3. Adult leaf spot reactions are given in Table 4-4.