Table 4-2. Adult stem rust reactions of entries in the 1975 Uniform Regional Hard Red Spring
Wheat Nursery (ARS-USDA, North Dakota, Miller - Statler)
Percent Severity and Reaction 1
-------------------------------------------------------- Average
Entry Langdon Carrington Oakes Minot Grandin C.I. 2
----------------------------------------------------------------------------------------
Marquis 20S 40S 40S 30S 30MS-5S 30.8
Justin 0-tMS t-5S tS-30S 0-tMS 5MS-tS,30S 1.8
Selkirk 0 0 0 0 0 0.0
Chris 0-ts 0-ts tS ts-0 ts 1.5
Waldron O,tMR-tMS 15MR t-30R 5MR,10S 15MR 2.9
ND 519 0 tMR* 0 0 tR* 0.3
ND 527 0 0 tR 0 tR 0.2
ND 531 0 tR* 0 0 tR 0.2
ND 532 tMR 15MR-tMS 10R-10MR 5MR,10S 20MR 3.8
ND 533 tR* 15MR-tMS 15R 5MR 20MR 3.9
LEW 0 0 0,tS 0 tR-tS 0.1
H678-1-64311 0 tMS 0 0,tS 20MS 3.6
WI 262T 0,tS 0,tMS 0,tS 0 15MS-tS 2.4
NEWANA 0 0 0 0 0 0.0
ND 522 0 tMR 10MR tR 5MR 1.5
ND 528 O-tMR tMR-tMS 10MR tMR-tMS 10MR-tMS 2.0
ND 534 0 0 0 0 tR* 0.1
ND 535 0-tMR tMR 1OR-5MR tR 10R 1.1
11-64-27 0 0 0 0 0,ts 0.0
MN 7083 0 0 0 0 tR* 0.1
MN 7086 0 0 0 0 0,ts 0.0
MN 70113 0 0,tMS 0 0 tMS 0.4
MN 70180 0 0 0 0 ts 0.5
MN 6728 0 0 0 0 tR* 0.1
MN 70175 tR* 0 tR tR tR* 0.4
MN 70121 0 0 0 0 tR* 0.1
Era 0 0 0,tS 0 tR* 0.1
Borah 0 0 0 0 0 0.0
Seeded: Langdon - May 14, Carrington - May 21, Oakes - May 20, Minot - May 13, Grandin - May
16.
1 = Coma - 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 and 151 at Grandin. 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 an entry at a location was determined by
multiplying percent severity by reaction were resistance (R)=0.2, moderately resistant
(MR) = 0.4, intermediate (M) = 0.6, moderately susceptible (MS) = 0.8, susceptible (S)
= 1.0 and t = 2.5. When a double reading occurred at a location only the severity and
reaction preceding the "dash" or "comma" was used to determine the coefficient.
* = Rust on peduncle.