Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
Setting up for removal of infested trees. Compare to image 5392794.
Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
Street after ALB infested trees were removed. Compare to image 5392793.
Pennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org
ALB adult.
Joe Boggs, Ohio State University, Bugwood.org
ALB adult with a penny for scale.
Joe Boggs, Ohio State University, Bugwood.org
ALB late instar larva with dime for scale.
Pennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org
ALB exit holes.
Daniel Herms, The Ohio State University, Bugwood.org
ALB exit holes are typically very round but can vary depending on the tree and thickness of the bark.
Joe Boggs, Ohio State University, Bugwood.org
Insert a pencil into a hole in the trunk. If the pencil extends more than an inch, you should investigate further!
Michael Bohne, USDA Forest Service, Bugwood.org
Adult emerging from tree.
Dennis Haugen, USDA Forest Service, Bugwood.org
ALB egg sites and exit holes.
Daniel Herms, The Ohio State University, Bugwood.org
ALB adult with egg sites.
Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
An older egg site is more difficult to see. Notice the diagnostic mandible marks at the edges!
Pennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org
Crown thinning is a symptom but typically is not noticed until infestations are severe.
Dennis Haugen, USDA Forest Service, Bugwood.org
Dieback symptom and thinning of an ALB infestation.
Dennis Haugen, USDA Forest Service, Bugwood.org
Sap oozing from egg sites.
Pennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org
Sawdust and/or frass may be found in branch crotches and around the base of the tree.