Insects and Spiders - native

unknown on Jul 2, 2025

Originally reported as Emerald Ash Borer (Agrilus planipennis)

Submitter does not have a specimen
EDRR Status: Ongoing monitoring

Description of specimen

Although I'm not officially trained, I'm a an avid naturalist, and after watching the Oregon Field Guide special on the Emerald Ash Borer, I believe there are a dozen or more ash trees showing the signs of infestation--with dying upper canopy.

Commentary

Thanks for your report. The tree canopies do look suspect for EAB. However, other things cause similar symptoms in ash. If you are able to see the stems of these trees, look for characteristic "D-shaped" exit holes, which there should be a lot (>10 per sq foot). Under the bark there will be S-shaped galleries.

EAB has been detected across the river outside Oregon City, so it wouldn't surprise me if EAB were in this area of the report, too. Just need more evidence to confirm EAB. www.OregonEAB.com

Wyatt Williams
July 28, 2025, 4:44 a.m.

ODF attempted to reach these trees last week but they were inaccessible.

Wyatt Williams
Aug. 11, 2025, 4:11 a.m.

Location

Billy Goat Island is an unofficial natural area east of Edgewater Road's southern end.

Expert Reviewer

Wyatt Williams, Ph.D.
Wyatt Williams, Ph.D.

Invasive Species Specialist

Oregon Department of Forestry

Private Forests Division

2600 State St. Bldg. D

Salem, OR 97310-0340



Office: 503-945-7472

wyatt.williams@oregon.gov

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