1. Department of Horticulture and Crop Science The Ohio State University Wooster Ohio USA
2. Department of Horticulture and Crop Science The Ohio State University Columbus Ohio USA
3. Department of Agronomy and Plant Genetics University of Minnesota St. Paul Minnesota USA
4. Department of Plant, Soil and Microbial Sciences Michigan State University East Lansing Michigan USA
5. Department of Plant Science Penn State University State College Pennsylvania USA
6. Department of Agronomy Purdue University West Lafayette Indiana USA
7. Department of Agronomy Iowa State University Ames Iowa USA
8. Department of Crop and Soil Sciences University of Georgia Athens Georgia USA