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​​​​​​​​​​​​​​​​​​​​​T​emporary quar​​​​​​antine in Washington County

​Temporary quarantine prohibits tree materials from all plant parts of ash, olive, and the white fringe tree, from movement outside Washington County.  

In response to the discovery of emerald ash borer (EAB), the Oregon Department of Agriculture (ODA) has adopted a temporary EAB quarantine as per Oregon Administrative Rule (OAR 603-052-0135), limiting the movement of ash, olive, and white fringe tree materials from Washington County. The purpose of the quarantine is to slow the spread of EAB through the restricted movement of tree materials to unaffected locations in the state. EAB is now considered the most destructive forest pest in North America, killing hundreds of millions of ash trees. This temporary quarantine will remain in effect until May 16, 2023. As more data becomes available, ODA will evaluate future quarantine parameters.

The Washington County EAB quarantine restricts the movement of several tree materials including but not limited to logs, green lumber, nursery stock, scion wood, bud wood, chips, mulch, stumps, roots, branches, and firewood of hardwood species.

ODA is establishing several processing and disposal resources in the area to limit the movement of ash, olive, and the white fringe tree materials to within the quarantine area. For processing and disposal resources, please view the list below.​

​Se adopta una cuarentena temporal en el condado de Washington para frenar la propagación del escarabajo barrenador esmeralda del fresno ​

La cuarentena temporal prohíbe el traslado fuera del condado de Washington de materiales arbóreos de todas las partes de la planta del fresno, el olivo y el laurel de nieve. ​

En respuesta al descubrimiento del escarabajo barrenador esmeralda del fresno (BEF), el Departamento de Agricultura de Oregon (ODA, por sus siglas en inglés) ha adoptado una cuarentena temporal del BEF según la Regla Administrativa de Oregon (OAR 603- 052-0135), limitando el movimiento de materiales de fresnos, olivos y laurel de nieve del condado de Washington. El objetivo de la cuarentena es reducir la velocidad de la propagación del BEF mediante la restricción del traslado de materiales arbóreos a lugares no afectados del estado. El BEF se considera actualmente la plaga forestal más destructiva de Norteamérica, ya que ha matado a cientos de millones de fresnos. Esta cuarentena temporal permanecerá en vigor hasta el 16 de mayo de 2023. A medida que se disponga de más datos, el ODA evaluará los futuros parámetros de cuarentena. 

​​La cuarentena del BEF del condado de Washington restringe la circulación de varios materiales arbóreos, incluyendo, entre otros, troncos, madera verde, material de vivero, madera de retoño, vástagos, astillas, mantillo, tocones, raíces, ramas y leña de especies de frondosas. ​

El ODA está estableciendo varios recursos de procesamiento y eliminación en la zona para limitar el movimiento de materiales de fresno, olivo y laurel de nieve dentro de la zona de cuarentena.  Para conocer los recursos de tratamiento y eliminación, consulte la lista que figura a continuación.

Initial detection

On June 30, 2022, emerald ash borer (EAB), an exotic beetle that infests ash trees, was discovered in Forest Grove, Oregon, marking the first confirmation of the invasive pest on the West Coast. The infested ash trees were immediately cut and chipped. 

ODA recently received federal funds to perform work on biocontrol of EAB and is using the Emerald Ash Borer Readiness and Response Plan for Oregon​ as a guide in its response to EAB. The plan was finalized in March 2021 and created through the collaborative efforts of a diverse group of stakeholders. 

​Pesticide list for Emerald Ash Borer in Oregon 

The intent of this list is to assist people in finding pesticide products whose labels allow for use to control EAB. The list is not an endorsement or recommendation to use these products and you must always follow the label directions. Do not hesitate to contact Pesticide staff​ with questions or for label clarification.​ ​​

Pesticide list​ for Emerald Ash Borer


Emerald Ash Borer brochure

Learn more about what EAB is, the biology, and signs and symptoms. EAB brochure

Emerald Ash Borer Identification Guide - English & Español

From Oregon State University Extension Service. EAB identification guide

Emerald Ash Borer information

EAB info from USDA APHIS

Emerald Ash Borer Look-Alikes

Photos of beetles and bugs that may be confused with the emerald ash borer. EAB look-alikes

Emerald Ash Borer Response Plan for Oregon

EAB Readiness and Response Plan for Oregon

Emerald Ash Borer Story Map

An interactive story map of the USDA’s history of combating the infestation and the continuing efforts to protect ash trees in the U.S. USDA APHIS Emerald Ash Borer Story Map

Forest Facts: Emerald Ash Borer (EAB) handout

From the Oregon Department of Forestry (ODF). Emerald Ash Borer handout
ODF Forest Health webpage

OPB new release: OR Dept. of Forestry Seed Recovery Work

From Oregon Public Broadcasting. Published March 1, 2022. Ahead of emerald ash borer’s arrival, Oregon foresters gather ash tree seeds

Oregon Forest Pest Detector Online Program

The College of Forestry's Oregon Forest Pest Detector (OFPD) free training course prepares you to identify and report high-priority exotic forest pests. Oregon Forest Pest Detector

Q & A: Biological Control for Emerald Ash Borer

Biological Control for EAB

Q & A: Changes in the Approach Toward Fighting Emerald Ash Borer

Changes in the approach toward fighting EAB

Q & A: Kiln Certifications, Treatments, and Labeling for Firewood

Firewood regulations

Q & A: Release and Recovery of Biological Control for Emerald Ash Borer

Release and recovery of biological control for EAB

Recognizing ash trees in Oregon, Washington and Northern California

From Oregon State University. Recognizing ash trees

Resources from the CO Dept. of Ag on Identifying EAB

Emerald Ash Borer webpage


Insect Pest Prevention & Management
635 Capitol St NE
Salem, OR 97301
Phone: 503-986-4636
Alt Phone: 1-800-525-0137
Fax: 503-986-4786

​​Please report sightings of emerald ash borers to the Oregon Invasive Species Online Hotline. ​

​Sign up to receive email updates about EAB.