1. Department of Agriculture, Central University of Technology, Private Bag, Bloemfontein, Free State Province, South Africa
2. Doctor of Plant Health Program, University of Nebraska–Lincoln, Lincoln, NE, USA
3. Department of Statistics, University of Nebraska–Lincoln, 343B Hardin Hall North, Lincoln, NE, USA
4. Department of Evolution and Ecology, The Ohio State University, 300 Aronoff Laboratory, Columbus, OH, USA
5. Department of Agronomy and Horticulture, Panhandle Research and Extension Center, University of Nebraska–Lincoln, 405 Avenue I, Scottsbluff, NE, USA
6. Department of Entomology, Panhandle Research and Extension Center, University of Nebraska–Lincoln, 405 Avenue I, Scottsbluff, NE, USA