Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Dave Powell, USDA Forest Service (retired), Bugwood.org

William M. Ciesla, Forest Health Management International, Bugwood.org

Terry L Spivey, Terry Spivey Photography, Bugwood.org

Terry L Spivey, Terry Spivey Photography, Bugwood.org

William M. Ciesla, Forest Health Management International, Bugwood.org

Joseph M. DiTomaso, University of California - Davis, Bugwood.org

Joseph M. DiTomaso, University of California - Davis, Bugwood.org