1. Department of Agricultural Biology, Colorado State University, 1177 Campus Delivery, Fort Collins, CO 80523, U.S.A.
2. Department of Forest Biological Sciences, University of the Philippines Los Baños, Laguna 4031, Philippines
3. United States Department of Agriculture Forest Service, Rocky Mountain Research Station, 240 West Prospect Road, Fort Collins, CO 80526, U.S.A.
4. Davey Resource Group, Inc., Urban & Community Forestry Services, Atascadero, CA 93422, U.S.A.
5. Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, U.S.A.