Objective:

To evaluate experimental winter wheat cultivars for resistance to stripe rust and agronomic performance in environments and cropping systems representative of northwestern Montana.  

Results:

Stripe rust symptoms developed early in the season, with the initial ratings being recorded on May 24. The average infection level was 4.8%, and no significant differences in infection were detected among wheat lines. Stripe rust infection increased during the growing season, and by June 30 stripe rust infection averaged 35.2% and ranged from 11.5% for MT1694 to 95.0% for Decade. Yellowstone had previously shown excellent resistance to stripe rust. Initially, infection levels were low, but by seasons end Yellowstone had a rating of 91.5%, indicating that a new race of stripe rust may be present.

Winter wheat yields averaged 134.3 bu/A, and ranged from 19.3 bu/A for Decade to 168.1 bu/A for MT16101 (Table 2). Yellowstone yielded 132.7 bu/A, but seven experimental lines produced significantly higher yields. Days to fifty percent heading averaged 149 days (May 28) and ranged from 144 days (May 23) for MT1695 to 152 days (May31) for MT1694. Height averaged 42.1 inches and ranged from 37.4 inches for MT1697 to 46.5 inches for MT1693. No significant differences were observed in percent lodging. Protein averaged 12.33% and ranged from 11.24% for MT1694 to 15.18% for Decade. Test weight averaged 58.3 lb/bu and ranged from 49.8 lb/bu for Decade to 61.6 lb/bu for MT1695.

Summary:

Several of the MSU entries have excellent resistance to stripe rust and are higher yielding than local standard winter wheat varieties.

Table 1. Materials Methods.

Seeding Date: 10/1/2015 Harvest Date: 8/15/2016
Julian Date: 274 Julian Date: 228
Seeding Rate: 80 lb/A Soil Type: Creston SiL
Previous Crop: Spring Wheat Soil Test: 209-32-244-34
Tillage: Conventional Fertilizer: 9-40-40, TD: 75-0-40
Herbicide: Huskie 11 oz/A + Axial 16.4 oz/A + NIS 1 qt/100gal + UAN 28% 1 qt/A

Table 2. Evaluation of MSU experimental lines, Kalispell, MT - 2016.

Entry HD Julian SR %
5/24		 SR %
6/9		 SR %
6/30		 HT in. LOD % YLD
bu/A1		 PRO %2 TWT
lb/bu1
MT16101 148 2.5 6.0 14.5 43.1 30.0 168.1 12.52 60.6
MT1694 152 25.0 6.5 11.5 44.7 0.0 167.6 11.24 60.3
MT1696 151 4.5 9.5 14.0 45.9 5.0 165.6 11.36 60.4
MT1695 144 0.0 16.0 55.0 42.5 2.5 164.7 11.45 61.6
MT16106 151 1.5 16.0 19.5 43.1 5.0 163.0 11.81 59.1
MT1693 151 1.5 7.0 16.5 46.5 0.0 160.5 11.42 60.3
MT16105 149 0.0 10.0 37.5 42.5 5.0 158.5 11.54 60.3
MT16102 148 15.0 23.5 28.5 43.1 2.5 152.8 11.55 60.2
MT1687 147 11.5 19.5 25.0 43.7 16.0 152.1 13.19 60.7
MT16104 150 0.0 29.5 45.0 43.3 2.5 148.0 11.85 59.7
MT1688 148 2.5 9.0 20.0 43.1 9.0 147.8 13.07 60.3
MT16103 147 2.5 27.5 30.0 40.2 7.5 145.7 12.10 60.2
MT1699 147 1.0 17.5 40.0 38.0 0.0 143.8 12.57 59.4
MT1690 143 2.5 14.0 25.0 43.1 33.0 142.8 14.05 59.3
MT16100 150 3.5 22.0 44.0 39.6 0.0 142.3 12.22 57.0
MT1697 148 25.0 18.0 35.0 37.4 0.0 139.1 12.22 59.3
MT1698 149 1.5 20.0 24.0 38.2 0.0 137.0 12.49 57.3
Judee 151 2.0 32.0 16.5 42.7 29.0 134.3 11.87 60.4
Yellowstone 151 7.0 47.5 91.5 44.1 15.5 132.7 11.74 55.7
MT1691 150 4.0 17.5 15.0 41.1 9.0 131.4 12.22 57.0
MT1692 150 2.0 25.0 24.0 42.5 42.5 126.1 12.80 57.3
MT1689 150 2.5 22.5 26.0 38.6 0.0 111.3 13.49 55.9
SY Wolf 147 0.0 37.5 42.5 42.3 11.5 107.3 13.09 53.4
Promontory 151 1.0 16.0 85.0 45.3 0.0 78.4 11.30 51.9
Decade 151 1.5 95.0 95.0 38.8 32.5 19.3 15.18 49.8
Mean 149 4.8 22.6 35.2 42.1 10.3 134.3 12.33 58.3
CV 0.9 200.8 26.2 21.8 2.5 127.9 8.6 2.48 2.1
LSD 2.6 ns 12.2 15.9 2.2 ns 23.9 0.63 2.5
Pr>F 0.0001 0.4462 0.0001 0.0001 0.0001 0.0613 0.0001 0.0001 0.0001

HD: heading; HT: height; LOD: lodging; YLD: yield; PRO: protein; TWT: test weight; ns: non-significant

1 adjusted to 13% moisture

2 adjusted to 12% moisture