1. USDA-ARS Plant Science Research Unit and Dep. of Agronomy and Plant Genetics; Univ. of Minnesota; 411 Borlaug Hall, 1991 Upper Buford Circle St. Paul MN 55108
2. USDA-ARS Plant Research Unit and Dep. of Plant Pathology; Univ. of Minnesota; 495 Borlaug Hall, 1991 Upper Buford Circle St. Paul MN 55108