Emerald Ash Borer*
Emerald ash borer is an invasive insect that damages ash trees (Fraxinus spp.). It can devastate ash tree populations in landscapes and natural areas. The larvae damage trees by eating plant tissue below the bark. Adults emerge from trees through “D”-shaped exit holes in the bark.
Emerald Ash Borer in Oregon
In July 2022 emerald ash borers were detected in Washington County, Oregon. See a press release (Oregon Department of Agriculture). Oregon ash (Fraxinus latifolius) is an important riparian tree species in Oregon.
How to Identify Emerald Ash Borer
Adult insects are 0.3 to 0.5 inch long, slender, and metallic olive to emerald green. They are active June through July. Larvae are 1 to 1.3 inches long, creamy white, with bell-shaped segments. They are found under the bark of ash trees throughout the year.
Be Alert and Report Sightings
Learn how to recognize ash trees and emerald ash borers and how to report a sighting. See emerald ash borer resources (OSU Extension Service).
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