The emerald ash borer is a small invasive beetle whose larvae tunnel under the bark of ash trees and cut off the flow of water and nutrients. Infested trees usually decline over a few years and die.
The problem for homeowners isn't only losing the tree. Dead ash wood becomes brittle and dangerous faster than many other species.
Is it an ash?
- Branches and buds grow in opposite pairs.
- Compound leaves with 5 to 9 leaflets.
- Diamond-patterned bark on mature trees.
Signs of emerald ash borer
- Thinning and dieback starting at the top of the crown.
- D-shaped exit holes in the bark, about 1/8 inch across.
- Heavy woodpecker activity and bark flecking.
- Vertical splits in the bark.
- Shoots sprouting from the trunk or base.

Your options
| Tree condition | Usual option |
|---|---|
| Healthy, high-value | Ask about preventive treatment |
| Some dieback | Assess; treatment may not be worth it |
| Mostly or fully dead | Remove |
As dead ash dries out, limbs drop without warning and the tree can become unsafe to climb.
What to plant instead
Choose a diverse mix of species so one pest can't wipe out your yard again. Native oaks, maples and other well-suited trees are good options; a local nursery can help match the site.
Need it fixed?
Dead & Hazardous Tree Removal across Erie County
A local Erie crew for removals, trimming, stumps and storm work, with phones answered around the clock.
Frequently asked questions
Can emerald ash borer spread to my other trees?
It attacks ash species. Other trees aren't affected by this beetle.
Can I burn or move ash firewood?
Moving firewood can spread invasive pests. Burn it locally and follow any state guidance on firewood movement.
Are treatments worth it?
For a healthy, valuable ash in a good location, sometimes. For a tree already in decline, usually not.
How do I know if my tree is safe?
Have it looked at. Signs like dead limbs, bark falling off and woodpecker damage mean it should be assessed.




