Emerald ash borer resources

Emerald ash borer, or EAB, is an invasive beetle that infests and kills ash trees. EAB has killed hundreds of millions of ash trees in the eastern United States. In 2022, EAB was confirmed in Oregon.

EAB threatens whole habitat types that are dominated by Oregon ash, including sensitive riparian zones. This pest has proven deadly to all ash species in North America and Europe.

Oregon can't eradicate emerald ash borers, but we are working to slow their spread by removing infested trees before larvae emerge.

OSU Extension gathered key emerald ash borer resources below.

Latest information

OregonEAB.com (in English)

This state resource has the most up-to-date information on emerald ash borer in Oregon. View the interactive map and learn what actions you can take. Even though EAB is here to stay, everyone can do something to slow its spread.

Oct 2025 | Online resource

Recommendations

Emerald ash borer in Oregon: what to do now — and what to plant next

Don’t remove healthy ash preemptively, learn the symptoms and start planning resilient replacements.

Kym Pokorny | Sep 23, 2025 | News story

What to do about emerald ash borer: Recommendations for tree protection in EAB-infested areas

Learn how to protect trees from emerald ash borer in areas where the pest has become established in Oregon. This guide is for residential and professional landowners and land managers in urban and natural areas where the pest has been detected.

Alexander Gorman, Chris Hedstrom, Karen Ripley, Wyatt Williams, Christine Buhl, Scott Altenhoff, Chris Benemann, Jim Gersbach, Max Ragozzino, Cody Holthouse, Angie Ambourn | Dec 2022 | OSU Extension Catalog

Don't move firewood (in English)

Buy it where you burn it during camping season. Firewood is a major pathway for invasive species. Transporting firewood can potentially lead to new infestations of invasive insects and diseases, which can lurk in firewood. See the pest list for Oregon species.

Apr 2024 | Online resource

Identification resources

Recognizing ash trees in Oregon, Washington and Northern California

How to identify our native and common landscaping ash trees, including look-alikes. All ash trees are susceptible to emerald ash borer, an invasive pest first sighted in Oregon in June 2022.

David C. Shaw | Jul 2022 | Educational gallery

Emerald Ash Borer - A New Invasive Pest (in English)

A 10-Minute University guest presentation by Dr. Gail Langellotto, Professor of Horticulture at Oregon State University about Emerald Ash Borer.

Gail Langellotto | Oct 2022 | Video

Oregon ash: Insects, pathogens and tree health

Oregon ash grows along the streams and wetlands of western Oregon and Northern California, where it provides important wildlife habitat. But these trees are threatened by the emerald ash borer, an insect pest that...

David C. Shaw, Jay W. Pscheidt, Alexander Gorman | Jan 2023 | OSU Extension Catalog

Emerald ash borer look-alikes (in English)

There are many bright metallic-green insects, but the emerald ash borer beetle is only a half-inch long and strictly associated with ash trees. Use the chart to help determine if EAB is present on your property.

Jul 2022 | Online resource

Monitoreo y Detección de Plagas Forestales en Oregon: El barrenador verde esmeralda del fresno (EAB)

Esta es una publicación bilingüe (inglés y español) para los trabajadores de jardinería y la pública, para ayudarles a proteger los árboles y bosques de Oregon. Incluye identificación del insecto, hospederos, ...

Brandy Saffell, Amy Grotta | May 2017 | OSU Extension Catalog Peer reviewed (Gray level)

Forest Facts: Emerald Ash Borer (in English)

The emerald ash borer (EAB), or Agrilus planipennis Fairmaire, is a highly destructive invasive forest pest that has killed over 100 million ash trees in the eastern U.S. since its first detection in 2002. Learn more about its biology, detection, treatment and proactive preparations. Oregon ash is a key part of riparian forests and wetlands west of the Cascades.

Jul 2022 | Online resource

Oregon Forest Pest Detector Field Guide

This visual field identification guide will help you identify the emerald ash borer and the Asian longhorned beetle — two invasive tree pests threatening Oregon forests. This guide supplements the Oregon Forest ...

Brandy Saffell, Amy Grotta | Jul 2022 | OSU Extension Catalog

Prevention and planning

Monitoring Oregon ash forests in the face of the emerald ash borer: A guide for small woodland owners and managers

The emerald ash borer threatens Oregon ash forests. This guide offers methods for long-term monitoring, helping landowners track changes and assess impacts on their trees and landscape over time.

David C. Shaw, Katie Hill, Karen Ripley, Dan Stark, Wyatt Williams | Feb 2025 | OSU Extension Catalog

Alternatives to Ash in Western Oregon: With a Critical Tree Under Threat, These Options Can Help Fill Habitat Niche

Oregon ash thrives in many areas of western Oregon, from floodplains to foothills. But this key tree is threatened by the spread of an invasive beetle known as the emerald ash borer, which kills ash. This ...

George Kral, David C. Shaw | Mar 2023 | OSU Extension Catalog

What do I do if I suspect an emerald ash borer infestation?

P: We have at least one ash tree that is showing top dieback. What should we do to try to confirm whether or not we have the beetle?

R: View answer | View all featured questions

How should our community respond to emerald ash borer?

P: I am chair of our city tree commission, and have a couple of questions about emerald ash borer (EAB). We have many planted ash trees in city parks and on rights-of-way, although the tree is now on the list of prohibited...

R: View answer | View all featured questions

Should we treat ash trees for emerald ash borer?

P: I just read about the emerald ash borer (EAB) appearing in Oregon. We have two large very nice ash trees that we don't want to cut down, no signs of infestation at this time. Would you recommend we go ahead and treat these with the pesticide injection that treats for the borer, just in case?

R: View answer | View all featured questions

Should I prune my ash trees now to help prevent an emerald ash borer infestation?

P: I live in Beaverton and I want to prune my two large ash trees before the fall winds come. I think emerald ash borers would find the sap from my pruned trees attractive. When is it safe to prune my ash trees?

R: View answer | View all featured questions

Are traps available to monitor and check for emerald ash borers?

P: Can I use traps to capture and minimize the damage done by emerald ash borers if my ash trees become infected?

R: View answer | View all featured questions

The hidden threat In firewood: Invasive forest pests

Invasive forest pests are being transported throughout the continent in untreated firewood. Learn about the threat of introducing or dispersing invasive forest pests.

David C. Shaw, Amy Grotta, Wyatt Williams, Raini Rippy, Steve Bowers | Jul 2025 | OSU Extension Catalog

Episode 23: Emerald Ash Borer (in English)

In this episode, Lauren Grand invites Christine Buhl and Daniel Stark on the podcast to discuss what the recent discovery of emerald ash borer in Oregon means and how to prevent it from spreading. Buhl is the state Forest ...

Lauren Grand, Dan Stark, Christine Buhl | Jul 2022 | Podcast episode

Contact your local Extension forester if you have further questions, or submit questions through Ask Extension (see below).

Aug 2022

Want to learn more about this topic? Explore more resources from OSU Extension: Forest health and management, Tree care, Flowers, shrubs and trees, Insects, Invasive species

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