How do I know if my Milwaukee ash tree has EAB?

Look for canopy dieback starting at the top and moving down, D-shaped exit holes about 1/8-inch across in the bark, S-shaped tunnels under loose bark, unusual woodpecker activity, and epicormic shoots (new growth) sprouting from the trunk. Once you see any of these, the tree is already several years into infestation.

Can an infested Milwaukee ash tree be saved?

Sometimes — but only if it's caught early (less than 30% canopy loss) and treated with a systemic insecticide like emamectin benzoate every 2–3 years for the rest of its life. Trees with more than 40–50% dieback are almost always past the point of successful treatment and become a safety hazard as they die.

How much does it cost to remove an EAB ash tree in Milwaukee?

Dead ash removal typically runs $600–$2,500 depending on size and location. Ash killed by EAB become brittle fast, which raises the difficulty and cost of safe removal — waiting makes it more expensive and more dangerous, not less.

Is my dying ash tree an emergency?

Ash killed by EAB become dangerous much faster than most dead trees — the wood turns brittle within one to two years and can shed large limbs or the entire top without warning. If your ash has significant dieback and is near a house, driveway, or where people gather, treat it as urgent.

Should I replace the ash after removal?

Yes — Milwaukee's canopy has taken a huge hit and every replacement matters. Consider EAB-immune species like oak, hackberry, Kentucky coffeetree, tulip poplar, or serviceberry. Avoid planting more ash.

Emerald Ash Borer in Milwaukee: Signs & Removal

Emerald ash borer (EAB) was confirmed in Wisconsin in 2008 and reached Milwaukee County shortly after. Since then, it has killed the overwhelming majority of untreated ash trees across the city and suburbs. If you have an ash tree on your property, you have three options: treat it, remove it, or wait and remove a dead, brittle, dangerous tree later. There's no fourth option — ash borer doesn't leave healthy trees alone.

What Ash Trees Look Like

Before you worry about EAB, make sure you actually have an ash. Ash trees in Milwaukee have:

Opposite branching — twigs and buds grow directly across from each other, not staggered.
Compound leaves with 5–11 leaflets on a single stem.
Diamond-pattern bark on mature trees — ridges and furrows that form consistent diamonds.

Not sure? Take a photo of the leaves, bark, and a full-tree shot and text it to us. We'll ID it for free.

The Five Signs Of EAB Infestation

1. Canopy dieback (top-down)

EAB kills the tree from the top down. If the crown is thinning while the lower canopy still looks OK, that's an early red flag.

2. D-shaped exit holes

About 1/8-inch across, distinctly D-shaped (not round). These are where adult beetles emerge. Look on the trunk and larger branches.

3. S-shaped tunnels under the bark

Peel back a small piece of loose bark — if you see winding S-shaped galleries in the wood, that's larval feeding. This is what actually kills the tree by cutting off nutrient flow.

4. Increased woodpecker activity

Woodpeckers strip bark to get at EAB larvae. If your ash suddenly has lots of shredded bark or "flecking" and increased woodpecker attention, EAB is the reason.

5. Epicormic shoots

New shoots sprouting from the trunk or base — the tree's last-ditch survival response.

Treat Or Remove? A Simple Decision Rule

Less than 30% canopy loss: treatment is viable if the tree matters to you (mature specimen, high property value). Requires re-treatment every 2–3 years, permanently.
30–50% canopy loss: gray zone. Treatment sometimes works, often doesn't. Get a professional assessment.
More than 50% canopy loss: remove it. The tree is dying and will fail. Every month you wait, the wood gets more brittle and the removal gets more dangerous.

Why Dead Ash Are More Dangerous Than Other Dead Trees

EAB-killed ash lose structural integrity fast. Wood becomes brittle within one to two years of tree death, and dead ash regularly shed large limbs or entire tops without warning — often in calm weather. That's why arborists price ash removal higher: climbing a dead ash is significantly more dangerous than climbing a healthy tree, and many require aerial-lift or crane assistance.

The economic argument is straightforward: an ash removed while it's still standing and somewhat intact costs less than an ash removed after it's shed limbs or partially collapsed. See Milwaukee tree removal cost for pricing detail.

What Comes Next

If you're not sure where your ash stands, get an assessment. We'll tell you honestly whether the tree is still treatable, whether it's an emergency, or whether you have time to plan the removal on your schedule. For emergency situations, see our storm damage guide.

Emerald Ash Borer in Milwaukee