1. Department of Bioagricultural Sciences and Pest Management; Colorado State University; Fort Collins CO USA
2. Department of Agronomy and Horticulture; University of Nebraska-Lincoln; Lincoln NE USA
3. Department of Crop Sciences; University of Illinois; Urbana IL USA
4. School of Agriculture; Western Illinois University; Macomb IL USA
5. Department of Agronomy and Horticulture, West Central Research and Extension Center; University of Nebraska-Lincoln; North Platte NE USA
6. Department of Agronomy; Kansas State University; Manhattan KS USA