Table 4-2. Adult stem rust reactions of entries in the 1978 Uniform Regional Hard Red Spring Wheat Nursery [USDA-SEA, AR, NDSU. (Miller-Statler)]. Percent Severity and Reaction 1 ---------------------------------------------------- Average Entry Oakes Fargo Minot Langdon Carrington C.I.2 ----------------------------------------------------------------------------------------- Marquis 20M 50S 0-ts 15S ts 15.9 Chris 0-tMS 0-tMS 0 0 0-ts 0.0 Waldron tR 0,tR,10MS 0 0 0 0.1 10R-5MR- ND 550 tR tMS 0 0 0 0.5 ND 557 0 10-R-tMR 0 0 0 0.4 ND 560 tR 5R 0 0 0 0.3 ND 561 0 0-5R 0 0 0 0.0 ND 563 0 tR 0 0 0 0.1 SD 2273 0 0 0 0 0 0.0 SD 2355 0 t-5R 0 0 0 0.1 ND 543 0 tR 0 0 0 0.1 MT 749 0 10-20MR 0 0 0 0.8 MT 7416 0 20MR-10MS 0 0 0 1.6 Era 0 t-l0MSS 0 0 0 0.4 MN 70170 0 10MR 0 0 0 0.8 MN 7125 0 0 0 0 0 0.0 MN 7222 0 tMS 0 0 0 0.4 MN 70181 0 0 0 0 0 0.0 MN 70202 0 tMSS 0 0 0 0.4 MN 7336 0 0 0 0 0 0.0 MN 7378 0 5MS 0 0 tS 1.3 NHS 183-74 0 30MS 0 0 0 4.8 NHS 1001-75 0 5MS 0 0 0-tS 0.8 75S5511 0 20MS 0 0 0-tS 3.2 WSMP 122 0 20MS 0 0 0 3.2 WA 6389 0 5MS 0 0 0 0.8 --------------------------------------------------------------------------------------- Seeded: Oakes - May 4 (overhead irrigation), Fargo - May 15, Minot - May 11, Langdon - May 11, Carrington - May 11 (flood irrigation). 1 = Comma - Separation of plants into 2 or more reaction classes (segregation or seed mixture). Dash - Range in reaction on each plant or range in severity between plants with same reactions. Natural inoculum - Additional inoculations of races 15B (TLM) and 151 (QSH) at Fargo. Readings at soft dough to mid-dough stages. 2 = Av. C.I. - Average coefficient of infection is the average of the 5 coefficients of infection for each entry. Coefficient of infection for each reading was determined by multiplying percent severity by reaction where resistant (R) = 0.2, moderately resistant (MR) 0.4, intermediate (M) -=0.6, moderately susceptible (MS) = 0.8 and susceptible (S) 1.0. When a double reading occurred. only the percent severity and the response preceding the comma or dash was used to determine the coefficient. Trace severity (t) = 2.5 percent.