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Invasive Pest Alert-Emerald Ash Borer

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. In Oregon, the establishment of EAB could devastate whole habitat types that are dominated by Oregon ash such as ash swales and sensitive riparian zones, as well as reduce urban forest cover. This pest has proven deadly to all ash species in North America and Europe, including the native Oregon ash (Fraxinus latifolia).

State officials are asking the public to learn what an emerald ash borer looks like and to report any sightings. This will help the state know how far and how fast this destructive insect is spreading in Oregon.

  1. Be alert: It is important to stop new outbreaks before they start. Early detection, coupled with rapid response, can stop the spread of new and emerging invasive species before they become established.

  2. Know how to identify the emerald ash borer: Insect identification Adult: 7.5 to 13.5 mm (0.3 to 0.5 inch) long, slender, and metallic olive to emerald green; active June through July Larva: 2.6 to 3.2 cm (1 to 1.3 inches) long, creamy white, with bell-shaped segments; found under the bark throughout the year; causes damage to tree by eating tissue below the bark. See photos, and about hosts, signs and symptoms.

  3. Report sightings of emerald ash borer: report online at the Oregon Invasive Species Council hotline or call 1-866-INVADER.


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