1. United States Department of Agriculture, Western Regional Research Center, Exotic and Invasive Weeds Research Unit, Albany, CA, USA
2. Montana State University, Department of Land Resources and Environmental Sciences, Bozeman, MT, USA
3. United States Department of Agriculture, Northern Plains Agricultural Research Laboratory, Pest Management Research Unit, Sidney, MT, USA
4. Montana State University, Department of Research Centers, Western Triangle Agricultural Research Center, Conrad, MT, USA