Scott Tunnock, USDA Forest Service, Bugwood.org

Donald Owen, California Department of Forestry and Fire Protection, Bugwood.org

Connecticut Agricultural Experiment Station , Bugwood.org

Scott Tunnock, USDA Forest Service, Bugwood.org

Donald Owen, California Department of Forestry and Fire Protection, Bugwood.org

USDA Forest Service - Region 2 - Rocky Mountain Region , USDA Forest Service, Bugwood.org