1. Department of Agronomy; Iowa State University; Ames IA USA
2. Department of Land Resources and Environmental Sciences; Montana State University; Bozeman MT USA
3. Department of Agronomy; University of Wisconsin; Madison WI USA
4. Group Crop Health; University of Rostock; Rostock Germany
5. Department of Statistics; Iowa State University; Ames IA USA
6. Dupont Pioneer; Johnston IA USA
7. U.S Department of Agriculture-Agricultural Research Service; Urbana IL USA