1. Red River Valley Agricultural Research Center; USDA-ARS; Fargo North Dakota
2. Department of Plant Pathology; North Dakota State University; Fargo North Dakota
3. Sugarbeet Physiology Institute; Inner Mongolia Agricultural University; Hohhot Inner Mongolia China
4. Department of Plant Sciences; North Dakota State University; Fargo North Dakota
5. University of Minnesota Extension Service; St. Paul Minnesota
6. Departamento de Fitotecnia; Universidade Federal de Viçosa; Viçosa MG Brazil