Professional emerald ash borer treatment is priced by the size of the tree, measured as trunk diameter at chest height. Trunk injection, the most effective option for established trees, typically runs about $10 to $20 per inch of diameter, so a 20-inch ash usually costs roughly $200 to $400 per treatment, repeated every two to three years. Soil drenches and bark sprays cost less per visit but must be repeated yearly and work best on smaller trees. Removing a medium to large ash, by contrast, often runs $800 to $3,000 or more, and dead ash is more expensive and dangerous to take down. For a healthy, well-placed ash, treatment is usually the cheaper path over a decade or more.
In this guide
Key Takeaways
- Pricing is per inch of trunk diameter, measured 4.5 feet above the ground (DBH).
- Trunk injection: typically $10–$20 per inch, every 2–3 years. Soil drench or bark spray: often $5–$10 per inch, every year.
- Treatment works best when the tree has lost less than about a third of its canopy.
- Ash removal commonly runs $800–$3,000+ for medium to large trees, more if the tree is dead, large or near structures.
- Get at least two quotes and ask which product, what rate, and how often it must be repeated.
How Emerald Ash Borer Treatment Is Priced
Arborists and tree care companies price EAB treatment by diameter at breast height (DBH), the trunk diameter 4.5 feet above the ground. To estimate it yourself, wrap a tape measure around the trunk at that height and divide the circumference by 3.14. A trunk that measures 63 inches around is about 20 inches in diameter.
The per-inch rate reflects the amount of insecticide the label requires, which scales with tree size, plus labor and travel. Most companies also have a minimum charge per visit, so a single small tree can cost more per inch than several larger trees treated together. Before getting quotes, confirm that your tree actually has, or is at risk of, EAB: our guide to emerald ash borer signs covers D-shaped exit holes, woodpecker flecking and canopy thinning. This page focuses on what professional treatment costs. For the broader picture on tree and garden pests, see our pest control guide.
Treatment Methods and Typical Costs
Trunk injection
The arborist drills small holes around the base of the trunk and injects a systemic insecticide directly into the sapwood, where the tree carries it up into the canopy. Emamectin benzoate is the most widely used injected product for EAB and generally protects for two years, sometimes three, per its label. Azadirachtin, a botanical option, is also injected but usually needs more frequent treatment.
- Typical range: about $10–$20 per inch DBH per treatment.
- Frequency: every 2–3 years for emamectin benzoate.
- Pros: Best-documented protection, works on large trees, no runoff into soil.
- Cons: Higher upfront cost, small wounds in the trunk, must be done by a licensed applicator in most states.
Soil drench or soil injection
Imidacloprid is applied to the soil around the trunk, either poured as a drench or injected a few inches deep. Roots take it up over several weeks. Homeowner products exist for smaller trees, while professionals can use higher-concentration formulations.
- Typical range: about $5–$10 per inch DBH for professional application.
- Frequency: every year.
- Pros: Cheaper per visit, no trunk wounds.
- Cons: Less reliable on large trees, slower to take effect, not suitable near water or on sandy soils where it can leach.
Basal bark spray
Dinotefuran is sprayed on the lower 4 to 6 feet of bark, where it soaks through and moves into the tree. It acts relatively quickly and is useful when a tree needs protection the same season.
- Typical range: similar to soil treatments, often $5–$10 per inch DBH.
- Frequency: every year.
- Pros: No drilling, fast uptake.
- Cons: Annual cost adds up, weather affects application timing.
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Cost Breakdown Table
| Option | Typical cost basis | Example: 12-inch ash | Example: 24-inch ash | How often |
|---|---|---|---|---|
| Trunk injection (emamectin benzoate) | ~$10–$20 per inch DBH | ~$120–$240 | ~$240–$480 | Every 2–3 years |
| Professional soil drench/injection | ~$5–$10 per inch DBH | ~$60–$120 | ~$120–$240 | Every year |
| Basal bark spray | ~$5–$10 per inch DBH | ~$60–$120 | ~$120–$240 | Every year |
| DIY soil drench product | Product cost only | Varies by product | Not recommended at this size | Every year |
| Removal of healthy ash | Size, access, location | ~$400–$1,000 | ~$1,000–$2,500 | One time |
| Removal of dead or declining ash | Size, hazard, equipment | ~$600–$1,500 | ~$1,500–$3,500+ | One time |
| Stump grinding | Stump diameter | ~$100–$250 | ~$200–$450 | One time |
These are typical ranges, not quotes. Your price will depend on the factors below, and minimum visit charges often apply to single small trees.
What Moves the Price
- Trunk diameter: The single biggest factor for treatment. A 30-inch tree costs roughly two and a half times as much as a 12-inch tree.
- Number of trees: Treating several ash trees in one visit spreads travel and setup, and many companies discount multiple trees.
- Region and competition: Prices tend to be higher in metro areas and where EAB has only recently arrived and demand is surging.
- Product choice: Injection products cost more than soil-applied ones, and some premium formulations are priced higher still.
- Tree condition: A tree already in decline may need a higher label rate, or the arborist may advise against treatment.
- Access: For removal, trees over houses, power lines, fences or in tight backyards need climbing crews or cranes, which raises cost sharply.
Treatment vs Removal: Running the Numbers
Consider a healthy 20-inch ash shading the south side of a house. At about $15 per inch, injection costs around $300 every two years, or roughly $1,500 over a decade. Removing the same tree might cost $1,000 to $2,000, plus stump grinding, plus the cost and wait of a replacement tree that takes many years to provide the same shade. In that case, treatment usually wins, especially if the tree also adds to property value and cooling.
The math shifts when:
- The tree has already lost more than about half its canopy. Treatment is unlikely to save it, and money is better spent on safe removal.
- The tree is in a poor location, crowding the house, a sewer line or other trees.
- You have many small, low-value ash trees in a woodlot. Removing and replacing selectively may make more sense.
- The tree is very large and old, where injection costs climb with every inch, but so does its value. Many owners still treat landmark trees.
One important point: dead ash wood becomes brittle quickly. Ash killed by EAB can drop limbs or fail at the base within a few years, and many tree crews will not climb dead ash, which means bucket trucks or cranes. Waiting until a tree is dead almost always makes removal more expensive than removing it while still sound.
When Treatment Makes Sense
Treatment is generally recommended for ash trees that are healthy or show only light symptoms, with less than about 30 percent canopy dieback, and that are within roughly 15 miles of a known EAB infestation. Preventive treatment before signs appear has the best success. A certified arborist can assess canopy condition and confirm the tree is a true ash (genus Fraxinus). Mountain ash is not a true ash and is not attacked by EAB; see our guide on growing mountain ash if you are unsure what you have.
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Can You Treat Ash Trees Yourself?
Homeowner soil-drench products containing imidacloprid are sold for EAB protection. Read the label: these products are typically meant for smaller trees, and published extension guidance generally points owners of larger trees, roughly over 15 to 20 inches in diameter, toward professional treatment because the homeowner rates may not move enough insecticide into a large canopy. DIY drenches must be applied in spring, need moist soil, and should not be used near ponds, streams or wells. Trunk injection products like emamectin benzoate are restricted-use or professional-only in many states.
Systemic insecticides can move into flowers. Ash is wind-pollinated and not a major pollinator plant, but avoid drenching near flowering plants in the root zone, and always follow label timing.
How to Get an Accurate Quote
- Measure and photograph each ash, including the canopy, before calling.
- Ask for an ISA Certified Arborist and a state pesticide applicator license number.
- Ask which active ingredient and product they will use, the rate, and how many years of protection to expect.
- Request the price per tree in writing, including any minimum charge, and whether multi-year or multi-tree discounts apply.
- Get a separate quote for removal of any tree the arborist does not recommend treating.
- Compare at least two or three companies; quotes can vary widely.
Some cities and HOAs offer cost-share programs for treating ash on private property near public trees. Check your city forestry department or extension office before booking.
Timing
Most treatments are applied in spring, from leaf-out through early summer, when the tree is actively moving water and nutrients. Trunk injection works best when soil is moist and the tree is transpiring; arborists avoid injecting during drought. Soil drenches need several weeks for uptake, so they are applied in early to mid spring. Book early in the year, because tree crews fill their spring schedules fast in EAB-affected areas.
For replacement planting ideas if you do lose an ash, our trees and shrubs guide covers choosing diverse, well-adapted shade trees.
Frequently Asked Questions
How much does it cost to treat an ash tree for emerald ash borer?
Typical professional trunk injection runs about $10 to $20 per inch of trunk diameter, so a 20-inch tree is commonly $200 to $400 per treatment. Soil and bark treatments cost less per visit but are repeated every year.
How often do ash trees need to be treated?
Emamectin benzoate trunk injections usually protect for two years and sometimes three, depending on the label and pest pressure. Imidacloprid soil treatments and dinotefuran bark sprays are typically applied every year.
Is it cheaper to treat or remove an ash tree?
For a healthy medium to large ash, a decade of treatment often costs about the same as or less than removal, stump grinding and replacement. For a tree that has already lost half its canopy, removal is usually the better use of money.
Do I need to treat ash trees forever?
For as long as EAB is present in your area, yes. Treatment protects the tree but does not eradicate the beetle. Some areas see lower pest pressure years after the initial wave, and arborists may then stretch intervals.
Why does dead ash cost more to remove?
Ash wood becomes brittle soon after the tree dies, so limbs can snap unpredictably. Crews often need bucket trucks or cranes rather than climbing, and the extra equipment and risk raise the price.
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