Omaha has an Ash tree problem, and it's not slowing down.
The Emerald Ash Borer (EAB) — a metallic green beetle roughly the size of a penny — has been confirmed in Douglas County since 2016. Since then, it has killed tens of millions of Ash trees across North America, and Omaha's neighborhoods are no exception. If you have an Ash tree in your yard and you haven't had a conversation about treatment yet, this is the article to read first.
What Is the Emerald Ash Borer?
EAB (Agrilus planipennis) is an invasive beetle from Asia that was first detected in the United States near Detroit in 2002. It spreads by laying eggs in the bark of Ash trees. The larvae tunnel under the bark, disrupting the tree's vascular system — the network that moves water and nutrients up and down the trunk. Once the tunneling is severe enough, the tree can no longer feed itself and dies.
The telltale sign is the D-shaped exit hole the adult beetle leaves when it emerges, roughly 1/8 inch wide. You might also notice vertical bark splitting, "blonding" (light-colored wood exposed when woodpeckers excavate for larvae), or crown dieback starting at the top of the tree and working downward.
The deceptive thing about EAB is that visible symptoms lag behind the actual infestation by 2-3 years. By the time you notice something wrong, the tree may already be beyond saving.
Treatment Window Is Critical — And Short
Here's what catches Omaha homeowners off guard: treatment must begin BEFORE the infestation reaches roughly 30-40% canopy dieback. Once a tree has lost that much crown, the vascular system is too compromised to distribute the treatment effectively.
The most effective treatment is trunk injection or soil drench with imidacloprid or emamectin benzoate. These systemic insecticides move through the tree's vascular system and kill EAB larvae as they feed. Trunk injection (e.g., TREE-äge) provides the best protection — roughly 2-3 years of efficacy per treatment — and can be done while the tree is still showing no symptoms.
Treatment typically costs $10–15 per diameter inch of the tree. A 20-inch diameter Ash would run approximately $200–$300 for a single treatment, every 2-3 years.
Compare that to removal.
Treatment vs. Removal: A Real Cost Comparison
Ash tree removal in Omaha runs $800–$3,500 depending on size, location, and access. A large Ash near a house, over a fence, or in a tight alleyway — the kind that dominates many Benson, Millard, and Westside yards — can hit $2,500–$4,000 when you factor in stump grinding and cleanup.
Over a 10-year period, treating a 20-inch Ash runs approximately $600–$900 (3 treatments at $200-$300 each). Removing the same tree likely costs $1,500–$2,500 minimum. Treatment is almost always the economically rational choice — if the tree is caught early enough.
Omaha-Specific Context
Douglas County had confirmed EAB presence as of 2016, meaning most untreated Ash trees in Omaha's older neighborhoods — Dundee, Benson, North Omaha, Harvey Oaks, Millard Highlands — are at high risk if they haven't been on a treatment program.
The Nebraska Forest Service and Omaha Public Works both have resources on EAB treatment and the tree inventory program. Omaha has also removed many street-side Ash trees proactively, but private property Ash trees are the homeowner's responsibility.
What to Do Right Now
- Identify whether you have an Ash. Ash trees have compound leaves (7-11 leaflets per stem), opposite branching, and diamond-shaped bark ridges. If you're not sure, a certified arborist can confirm in minutes.
- Check for symptoms. Look for D-shaped exit holes, vertical bark cracks, crown dieback from the top, or heavy woodpecker activity. Even one D-hole is a red flag.
- Get an assessment. If the tree is still healthy or shows early symptoms, start a treatment plan immediately. Don't wait until next season.
- If removal is necessary, plan it. Dead Ash wood becomes extremely brittle within 1-2 years. An Ash that's 50% dead today can become dangerous to remove within 18 months as the bark peels and limbs become unpredictable.
The worst time to deal with an EAB-infested Ash is after it's dead. The best time was 5 years ago. The second-best time is right now.
About the Author
Andrew is the owner of Midwest Roots Tree Services and a certified arborist based in Omaha, Nebraska. He has been working with Omaha's trees for over three years and specializes in hazardous removal and tree health diagnostics. Schedule a free assessment.