Emerald Ash Borer Treatment in Vancouver, WA
Emerald ash borer was confirmed in Vancouver in August 2026, the first detection anywhere in Washington, and it kills the ash trees it reaches. Priority Tree Service evaluates ash across Vancouver, WA and all of Clark County: we find the ash on your property, measure each tree against the published treatment thresholds, and tell you whether it can still be protected or whether replanting is the better use of your money. The visit is free, same as any of our estimates, and the treatment is arranged through us and carried out by a licensed pesticide applicator.
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Emerald Ash Borer Treatment in Vancouver, WA
Reviewed by Stephen Douglas, ISA Certified Arborist
- What it covers
- Emerald ash borer reached Vancouver in 2026. We identify your ash trees, assess whether each one can still be protected, and manage the treatment.
- Who does the work
- Stephen Douglas, ISA Certified Arborist and TRAQ qualified, identifies the tree and writes the recommendation. The trunk injection is carried out by a licensed pesticide applicator.
- Where we work
- Vancouver, WA and every community in Clark County, from Salmon Creek to Camas and Washougal.
- Licensed and insured
- Washington contractor license PRIORTS781KC, fully insured, A+ rated by the BBB. Free written estimates.
The team did an outstanding job. They were fast, thorough, and clearly knew what they were doing.
How Emerald Ash Borer Treatment Works
It starts with identification, because most people are not sure whether they own an ash at all. Oregon ash is the only ash native to the Pacific Northwest, and it grows in wet ground: creek bottoms, floodplains, ditch lines, and the low corner of a yard that stays soggy until April. The fastest check is opposite branching, since very few trees here grow their twigs in matched pairs directly across from each other.
Then the tree gets a real assessment, because not every ash is worth treating and we would rather tell you that in the driveway than sign you up for something. Oregon's Department of Forestry publishes the clearest thresholds in the region and they are the ones we use: a healthy ash six inches in diameter or larger is a good candidate, and treatment stops being reliable once a tree has lost more than about 30 percent of its canopy. Past that, replanting is the better use of your money.
If your tree is a candidate, the effective option is a systemic insecticide injected into the trunk, applied in spring once the leaves are out and repeated every two to three years. Cover sprays are among the least effective, because they never reach the larvae feeding under the bark. The application itself is performed by a licensed pesticide applicator. We handle the diagnosis, the recommendation, the scheduling, and the follow-up visits, so the whole thing stays with one company you already know.
Treating an ash is a long commitment rather than a cure. The beetle stays in the landscape, so a protected tree stays on the schedule for the rest of its life. ODF estimates a tree can be treated for roughly 20 years before the accumulated cost matches removing and replacing a healthy one, which turns out to be a useful way to decide. If this tree matters to you for the next two decades, treatment pencils out. If it does not, we will help you plan the replacement instead.
How to tell whether the beetle is already in your tree
You will almost certainly see the damage before you see the insect. The adult is only about half an inch long and spends most of its life inside the tree, so the tree itself is what tells you, and it tells you in a fairly reliable order.
- 01
Thinning from the top down
The canopy goes sparse high up and works downward. It is the earliest sign and the most often missed, because it looks like ordinary drought stress.
- 02
Heavy woodpecker activity
Woodpeckers strip patches of bark to get at the larvae. People frequently notice the blond patches before they notice anything else.
- 03
Sprouts from the trunk
Tender shoots erupting straight out of the trunk or the big limbs, the tree trying to make up for a canopy that is failing.
- 04
D-shaped exit holes
About an eighth of an inch across with one flat side, left by adults on their way out. The most definitive sign, and usually the latest.
Seeing one or two of these is not a diagnosis, and several of them show up on a drought-stressed tree that has nothing wrong with it beyond a hard four years. That is what the evaluation settles. Reach out and we will come read the tree.
What Our Ash Borer Service Covers
- Ash identification across your whole property
- Canopy and trunk assessment against published treatment thresholds
- A straight recommendation to treat, monitor, or replace
- Trunk injection performed by a licensed pesticide applicator
- Scheduling and reminders on the two to three year cycle
- Written arborist reports for an HOA, an insurer, or your own records
- Removal and replanting when a tree is past saving
How to Book an Ash Tree Evaluation in Vancouver, WA
Start with the evaluation. Everything else follows from what your trees actually turn out to be.
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Ask Us to Come Look
Call, text, or send the form. You do not need to know whether you own an ash. Working that out is the point of the visit, and a good share of these calls turn out to be maple or alder.
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Stephen Identifies and Measures
He walks the property, identifies every ash on it, measures trunk diameter, and reads how much canopy each tree has already lost. That is a free visit.
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You Get a Straight Recommendation
Treat, monitor, or replace, tree by tree, against the thresholds Oregon's Department of Forestry publishes. In writing if you want it for an HOA or an insurer.
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We Schedule and Manage It From There
For trees worth protecting, we arrange the trunk injection with a licensed pesticide applicator, in spring after the leaves are out, and we keep you on the two to three year cycle so nobody has to remember it.
Why the Evaluation Comes First
You may not have an ash
A good share of these calls turn out to be maple, alder, or walnut. Fifteen minutes on site settles it, and if your trees are fine, we will say so and leave you alone.
The threshold is measurable
Canopy loss and trunk diameter decide whether a tree is still treatable. That is a reading somebody has to take at the tree, not a guess from a photo.
One company start to finish
Diagnosis, treatment, the follow-up cycle, and removal if it comes to that. You are never handed a list and told to go find someone else.
The diagnosis is the hard part
Deciding whether a tree is worth treating takes an ISA Certified, TRAQ-qualified read. Stephen gives you that, in writing if you want it, before anyone touches the tree.
What Affects Emerald Ash Borer Treatment Cost in Vancouver, WA
Treating an ash is an ongoing commitment rather than a one-time purchase, so it is worth understanding what you are signing up for before you start.
- Trunk Diameter
- Injection is dosed by the size of the tree, so a 30-inch ash costs meaningfully more per treatment than a 10-inch one.
- How Many Ash You Have
- Several trees on one property treated in the same visit costs less each than one tree on its own.
- The Repeat Cycle
- Every two to three years, indefinitely. The beetle does not leave the area, so the real figure to weigh is the cost over a decade, not the cost this spring.
- Whether the Tree Qualifies
- Past roughly 30 percent canopy loss, treatment stops being reliable and the money is better spent on removal and replanting. That is a measurement, not an opinion.
- Removal If It Comes to That
- Ash wood goes brittle fast once the tree dies, and a dead ash gets harder and more expensive to take down every year it stands. Waiting has a price too.
- Reports You Need
- A written arborist report for an HOA, an insurer, or a permit is separate work from the evaluation itself.
Oregon's Department of Forestry estimates you could treat a tree for roughly 20 years before the accumulated cost matches removing and replacing a healthy one. If this tree matters to you for the next two decades, treatment pencils out. If it does not, we will help you plan the replacement instead.
Get Your Free EstimateMost of this work stays close to home. Emerald Ash Borer Treatment in Felida is a regular call for us, and we cover Ridgefield, La Center, and Battle Ground on the same terms, along with the rest of Clark County.
Emerald Ash Borer Treatment in Vancouver, WA and Across Clark County
We bring emerald ash borer treatment to every community in Clark County, from Vancouver and Salmon Creek to Battle Ground, Camas, and Washougal. ISA Certified Arborist-led, fully insured, free estimates.
Priority Tree Service
ISA Certified Arborist · Vancouver, WA
191 Google reviewsEmerald Ash Borer Treatment in Vancouver, WA: FAQ
Has emerald ash borer been found in Clark County?
Yes. It was confirmed in Vancouver in August 2026, the first detection in Washington, and a firewood quarantine took effect the same month. That does not mean every ash in the county is infested, but it does mean the decision about your ash is a real one now rather than a hypothetical.
How do I know whether I have an ash tree?
Look for twigs and buds growing in matched pairs directly opposite each other, leaves made up of five to nine leaflets on a single stalk, diamond-patterned ridged bark, and paddle-shaped seeds. Two or three of those together and you almost certainly have an ash. If you would rather not guess, that is what the evaluation is for.
Can my ash tree be saved?
Often, if it is caught early. A healthy ash six inches in diameter or larger is a strong candidate. Once a tree has lost more than roughly 30 percent of its canopy, treatment stops being reliable and removal becomes the sensible path. We measure that on site and tell you honestly which side of the line your tree is on.
How often does an ash tree need to be treated?
Every two to three years, in spring after the leaves come out, for as long as you want to keep the tree. The beetle does not leave the area, so protection has to be maintained. It is closer to a service plan than a one-time fix, and it is worth knowing that going in.
Do you spray for emerald ash borer?
No, and neither should anyone else. Cover sprays are among the least effective options because they never reach the larvae feeding under the bark. The method that works is a systemic insecticide injected directly into the trunk, and it is performed by a licensed pesticide applicator.
Is treating cheaper than removing the tree?
In the near term, yes. Oregon's Department of Forestry estimates you could treat a tree for about 20 years before the accumulated cost matches removing and replacing a healthy one. There is also a cost to waiting: ash wood goes brittle fast once the tree dies, and a dead ash gets harder and more expensive to take down every year it stands.
What Vancouver, WA Homeowners Say
On time very friendly they get back to you by phone, text or email what ever way you contact them very fast. I would defiantly refer them to any of my family and friends.
Stephen was awesome! He arrived on time, completed the job well, and cleaned up after himself! His respectful demeanor and professionalism was perfect, and they were easy to talk to. I would highly recommend him!
We needed immediate service due to dangerously hanging limbs. Priority was able to come out the same day and get us through. They came back as promised 2 days later for clean up. Very friendly knowledgeable and dependable!
Often Paired With Emerald Ash Borer Treatment
Where These Numbers Come From
- Washington State Department of Agriculture announced the first confirmed emerald ash borer detection in Washington, in Vancouver, in August 2026. Checked August 31, 2026
- Oregon Department of Forestry, EAB insecticide treatments sets the treatment thresholds used on this page: healthy ash six inches and up, no more than 30 percent canopy loss, trunk injection every two to three years, and roughly 20 years of treatment before the cost matches removal and replacement. Checked August 31, 2026
- City of Vancouver, Urban Forestry: emerald ash borer gives the city's ash identification guidance and its own approach of injecting healthy mature ash while removing the small and declining ones. Checked August 31, 2026
- Washington Invasive Species Council is where a suspected sighting should be reported, and covers the firewood quarantine. Checked August 31, 2026
Ready When You Are
Get a fast, friendly, no-pressure estimate for emerald ash borer treatment in Vancouver, WA and across Clark County.
