1. Dep. of Agronomy and Horticulture
2. USDA-ARS and Dep. of Agronomy and Horticulture
3. Dep. of Agronomy and Horticulture, West Central Res. and Ext. Center; North Platte NE 69101
4. Dep. of Agronomy and Horticulture; Univ. of Nebraska; Lincoln NE 68583
5. Dep. of Agronomy and Horticulture, Panhandle Research and Extension Center; Scottsbluff NE 69361
6. Plant Science Dep.; South Dakota State Univ.; Brookings SD 57007
7. Soil and Crop Sciences Dep.; Texas A&M Univ.; College Station TX 77843
8. Sustainable Agriculture Res. and Ext. Center; Univ. of Wyoming; Lingle WY 88223
9. Dep. of Plant Pathology; Univ. of Nebraska; Lincoln NE 68583