Can I save my tree if it has Emerald Ash Borer?

If the infestation is caught early, professional insecticide treatments can sometimes save the tree. If more than half the canopy is already dead, removal is usually the only option.

Do all holes in the bark mean the tree is dying?

Not necessarily, but any boring insect activity is a red flag for a Green Ash. Have a professional confirm the type of pest to be sure.

Why are there holes in my Green Ash tree? Causes and fixes

Check these first

Inspect the trunk for small D shaped holes.
Look for thinning leaves in the upper canopy.
Check for increased woodpecker activity on the bark.

Likely causes

Emerald Ash Borer
Most likely
How to tell: Look for small D shaped holes in the bark and S shaped tunnels underneath. You might also see woodpeckers pecking at the tree more than usual.
What to do: Contact a certified arborist right away to discuss systemic insecticide treatments. If the infestation is severe, the tree may need to be removed to protect others nearby.
Ash Bark Beetles
Possible
How to tell: These beetles create tiny round holes and usually attack trees that are already stressed or dying. They are often a secondary issue rather than the primary killer.
What to do: Improve the overall health of the tree by providing deep watering during dry spells. Prune away dead or dying branches to reduce the habitat for these pests.

Pests on other plants

Find out what's wrong with your green ash

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

If you find D shaped exit holes, the situation is critical and requires professional intervention. It is normal to see a few insects on a healthy tree, but boring pests are always a serious concern.

Stopping it coming back

Keep your tree healthy with consistent watering and avoid wounding the bark during lawn maintenance. Consult an arborist about preventative systemic treatments if Emerald Ash Borer is in your area.

Green Ash: pests? Check yours with a photo

Every plant is a little different. Take a photo of your green ash and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Can I save my tree if it has Emerald Ash Borer?: If the infestation is caught early, professional insecticide treatments can sometimes save the tree. If more than half the canopy is already dead, removal is usually the only option.
Do all holes in the bark mean the tree is dying?: Not necessarily, but any boring insect activity is a red flag for a Green Ash. Have a professional confirm the type of pest to be sure.

Why are there holes in my Green Ash tree?