1. Department of Biology and Microbiology, South Dakota State University, Brookings, 57007
2. Panhandle Research and Extension Center, University of Nebraska–Lincoln, Scottsbluff, 69361
3. Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Rapid City, 57702
4. South Dakota State University Extension Pierre Regional Center, Pierre, 57501
5. Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, 57007