1. Oklahoma State University, Department of Entomology and Plant Pathology, Stillwater, OK 74078-3033
2. USDA Forest Service, Forest and Woodland Ecosystems, Rocky Mountain Research Station, Moscow, ID 83843
3. University of Idaho, Department of Entomology, Plant Pathology and Nematology, Moscow, ID 83844-2329
4. Michigan Technological University, School of Forest Resources and Environmental Science, Houghton, MI 49931