Emerald Ash Borer: Identification, Treatment & What to Do Next
EAB was first spotted in Forest Grove, Oregon in 2022 and has been spreading across the Pacific Northwest ever since. If you have ash trees on your property, this guide gives you the information you need to make a smart decision before it's too late. EAB has been called "a natural disaster in slow motion" — and once a tree is infected, the treatment window closes permanently.
What's inside
- How to identify an ash tree and assess EAB risk
- Early warning signs of EAB infestation — including S-shaped galleries and D-shaped exit holes
- Your three options: Treatment, Removal & Replacement, or Do Nothing — and the honest case for each
- Why treatment can only be done before EAB is present — and why timing matters
- When to call an ISA-certified arborist for a formal assessment



