1. 411 Borlaug Hall, 1991 Buford Circle, Univ. of Minnesota St. Paul MN 55108
2. USDA‐ARSUniv. of Minnesota St. Paul MN 55108
3. Dep. of Agronomy & Plant GeneticsUniv. of Minnesota St. Paul MN 55108
4. Univ. of Minnesota Crookston MN 56716
5. Dep. of Plant PathologyUniv. of Minnesota St. Paul MN 55108
6. Usda‐Ars Fargo Nd 58105