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Forest health

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ODA places quarantine on Washington County to slow spread of emerald ash borer

In response to the discovery of emerald ash borer (EAB) in Forest Grove last summer, the Oregon Department of Agriculture (ODA) has placed a temporary EAB quarantine on Washington County as per Oregon Administrative Rule (OAR 603-052-0135). The quarantine limits the movement of ash, olive, and white fringe tree materials from Washington County. Not moving wood, nursery stock or other materials from affected species to unaffected locations in the state should help slow the spread of emerald ash borer. EAB is now considered the most destructive forest pest in North America, killing hundreds of millions of ash trees, both native and non-native ornamental trees. This temporary quarantine is in effect until May 16, 2023. Read more about the quarantine

Roundup of Oregon EAB news

Detailed information about the emerald ash borer:

Datos forestales acerca del barrenador esmeralda del fresno:

About the Forest Health Unit

The Forest Health Unit helps maintain and improve the health of Oregon's private and state-owned forests.

Our forest health professionals conduct aerial and ground surveys to monitor forest insects and tree diseases. They provide technical advice and training in the use of integrated pest management principles to help professional foresters and landowners meet their management goals and objectives.

Stewardship foresters, urban foresters, forest entomologists and pathologists can help landowners identify forest pest problems and develop strategies to manage pests. Contact a stewardship forester or the Forest Health Unit for more information.

View more information about the unit.

Factsheets & information

Maps & data

Saving Oregon Ash video

For the past few years ODF's Forest Health team has been working with scientists from the USDA Forest Service on a first-of-its-kind effort to save as much of the gene pool of the Oregon ash tree from the expected ravages of the emerald ash borer. The borer is an invasive insect pest first seen in Oregon in summer 2022 that could nearly wipe out this tree as it has done to other ash species in the central and eastern U.S. Seed from throughout the Oregon range of our native ash species is being collected for long-term storage at two USDA Forest Service locations - Dorena Genetic Research Center in Cottage Grove and the National Seed Lab in Fort Collins, Colorado. Watch why this effort is so important to the future of Oregon wetlands and streamside woodlands.


Forest health fly over video


Drought and forest health video

Bark beetles part 2 video

Bark beetles part 1 video

Bark beetles part 3 video

Report an invasive pest



Oregon Bee Project


Oregon Invasive Species Council


Forest Health Unit