1. Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, 5403-1st Avenue South, Lethbridge, AB T1J 4B1, Canada.
2. Extension Entomology, North Dakota State University, 210 Walster Hall, PO Box 6050, Fargo, ND 58108-6050, USA.
3. Department of Land Resources and Environmental Sciences, Montana State University, 334 Leon Johnson Hall, Bozeman, MT 59971, USA.
4. Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, PO Box 1030, 1 Airport Road, Swift Current, SK S9H 3X2, Canada.
5. Department of Plant Sciences, Crop Development Centre, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada.
6. Brandon Research and Development Centre, Agriculture and Agri-Food Canada, PO Box 1000A, 2701 Grand Valley Road, Brandon, MB R7A 5Y3, Canada.