Ignazio Graziosi, University of Kentucky, Bugwood.org
Hemlock mortality caused by HWA in the Great Smoky Mountains.
William M. Ciesla, Forest Health Management International, Bugwood.org
Decline and mortality caused by HWA.
Jason Van Driesche, Bugwood.org
HWA damage on eastern hemlock.
James Johnson, Georgia Forestry Commission, Bugwood.org
Pale crown appearance with no new growth indicate this tree is under severe attack from HWA.
Chris Evans, University of Illinois, Bugwood.org
Symptoms of HWA infestation thin foliage and yellowing needles.
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
HWA infestation.
Elizabeth Willhite, USDA Forest Service, Bugwood.org
HWA on containerized hemlock.
Michael Montgomery, USDA Forest Service, Bugwood.org
Ovisacs on the underside of a branch.
Chris Evans, University of Illinois, Bugwood.org
HWA on eastern hemlock.
John M. Randall, The Nature Conservancy, Bugwood.org
HWA infestation.
Bruce Watt, University of Maine, Bugwood.org
Infested branch from below.
Michael Montgomery, USDA Forest Service, Bugwood.org
Adult and eggs inside an ovisac.
Lorraine Graney, Bartlett Tree Experts, Bugwood.org
Woolly ovisac and crawler.
Kelly Oten, North Carolina Forest Service, Bugwood.org
Settled crawler of HWA (Adelges tsugae).
Pennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org
HWA eggs on hemlock (Tsuga spp.)