Emerald Ash Borer (EAB)
AdultS: 1/3-1/2 inch long, 1/8 INCH WIDE, metallic olive to emerald green; active MAY-AUGUST; LARVAE cause damage to ash trees by eating tissue below the bark.
Emerald Ash Borer In The News
2024
October 24, 2024: Researchers seek to identify borer-resistant ash trees
October 8, 2024: New Detections of Emerald Ash Borer Signal Plan is Working
August 29, 2024: Salem responds to news of emerald ash borer infestation in Marion County
August 19, 2024: Emerald ash borer beetle has invaded 3 more Oregon counties
July 2024: New pests threaten Portland’s trees. They could make future heat waves even hotter
April 2024: State crews remove trees in Washington County to slow spread of emerald ash borer
2023
2022
December 20, 2022: Temporary quarantine adopted in Washington County to slow the spread of emerald ash borer (Oregon Department of Agriculture)
Bulletin: Oregon Tree Health Threats
To sign up to receive the Oregon Tree Health Threats Bulletin directly, please send a request to Jim.GERSBACH@odf.oregon.gov
Videos
Resources for Property Owners and Community Members
Learn to identify EAB and about host trees, signs, and symptoms.
NEW! A Pocket Guide to Emerald Ash Borer (.pdf) (2024)
Report sightings of EAB here.
Share information about emerald ash borer with others, including neighbors, fellow gardeners, hikers, mushroom hunters and campers.
Do not move or transport ash wood: Even after a tree has died or has been cut down, there is still the possibility for the emerald ash borer to be present in the wood. Keeping the wood on the same site as the infected tree can help to slow the spread of the insect.
(updated 5/23) Washington County Emerald Ash Borer Temporary Quarantine Alert [en español] <- NEW!
What to do if you live in an infested area and have ash, olive, or white fringetree
Managing the Threat of Emerald Ash Borer Invasion in a Changing Climate (pdf)
Emerald Ash Borer Survey Dashboard - This online map provides users with the preliminary results of visual surveys conducted by trained field staff. This information is not final and is updated regularly.
Oregon Department of Forestry Emerald Ash Borer Factsheets
Agency Resources
Grant Opportunities
New Publications
Factors Affecting Distribution of Emerald Ash Borer Parasitoids in An Urban Environment (2023) by SUNY College of Environmental Science and Forestry and USDA APHIS — Investigates how urban land cover impacts both the establishment and distribution of introduced biological control agents. The study indicates that parasitoids, such as Tetrastichus planipennisi, can be successfully established and widely distributed in urban areas.
Protection of North American Ash Against Emerald Ash Borer with Biological Control: Ecological Premises and Progress Toward Success (2023) by the USDA, UMASS, and the Connecticut Agricultural Experiment Station — Investigates how EAB suppression is likely to expand geographically as parasitoid populations increase and spread to new areas. The study looks at how surviving regenerating ash is observed in some sites with early parasitoid releases.
Oregon Ash: Insects, Pathogens and Tree Health (2023) by Oregon State University Extension (also available in Spanish at this same website)
Wood Decay Fungi Associated with Galleries of the Emerald Ash Borer (2023) by the University of Minnesota and Uruguay’s Instituto Nacional de Investigación Agropecuaria
Resources for Government Agencies/Professionals
Emerald Ash Borer Task Force
December 10, 2024 - Transcript
November 12, 2024 - Transcript
October 8, 2024 - Transcript
September 10, 2024 - Transcript
August 13, 2024 - Transcript
July 9, 2024 - Transcript
June 11, 2024 - Transcript
May 14, 2024 - Transcript
April 9, 2024 - Transcript
March 12, 2024 - Transcript
February 14, 2024 - Transcript
January 10, 2024 - Transcript
December 12, 2023 - Transcript
November 14, 2023 - Transcript
October 10, 2023 - Transcript
September 12, 2023 - Transcript
August 8, 2023 - Transcript
July 11, 2023 - Transcript
June 13, 2023 - Transcript
May 9, 2023 - Transcript | Video Recording
November 8, 2022 - Transcript/Audio Recording
October 11, 2022 - Agenda | Transcript/Audio Recording
September 13, 2022 - Agenda | Video Recording | Transcript/Audio Recording
August 9, 2022 - Agenda
August 2, 2022 - Agenda | Transcript/Audio Recording
Other Insect Pest Species of Concern
