Emerald Ash Borer Treatment in Ottawa

Emerald Ash Borer Treatment in Ottawa protects ash trees from one of the most destructive forest pests in North America. The emerald ash borer (EAB) has killed millions of ash trees across in Ottawa and the surrounding area, and early detection combined with chemical injection can save mature trees that would otherwise decline within three to five years. Our ISA Certified Arborists assess ash health, confirm EAB activity, and deploy TreeAzin-type injections during the optimal treatment window from late spring to early summer. We work across Ottawa and the surrounding municipalities, helping homeowners decide whether treatment makes economic sense or whether removal and replacement is the better choice. Call us at (343) 459-4991 for a free estimate, or visit our tree disease detection page to learn how we diagnose pest and disease problems.

Why Emerald Ash Borer Treatment Matters in the Ottawa Area

Ash trees (green ash, black ash, and white ash) are common in Ottawa neighbourhoods, along street verges, and in ravine lots. The emerald ash borer arrived in in Ottawa and the surrounding area around 2002 and has spread steadily westward. An infested ash shows thinning crown, branch dieback, and D-shaped exit holes in the bark where adult beetles emerge. Once EAB is confirmed, untreated trees typically die within two to four years. Early intervention with chemical injection can extend tree life by five to ten years, giving you time to plan removal, plant replacements, or preserve a mature specimen if it holds landscape or heritage value.

Detect EAB infestation through crown thinning, bark damage, and exit holes.
Inject TreeAzin or similar systemic insecticide into the tree's sapwood in late spring or early summer.
Repeat treatment every one to two years to maintain protection while the tree recovers.
Monitor treated trees for continued health improvement and plan removal if treatment fails.
Document treatment for your property records and future sale disclosure.

Treatment is most effective on trees with 50 percent or more of their crown still intact. Severely declining trees are poor candidates and should be removed to prevent sudden failure and clear the way for new planting.

Key info: In Ottawa, we treat 15 to 25 ash trees per season. A typical treatment on a mature tree (12 to 18 metres tall) costs between $400 and $800 per injection, depending on trunk diameter and access. Homeowners often combine treatment with structural pruning to remove deadwood and improve crown balance while the tree recovers.

How We Treat Ash Trees for Emerald Ash Borer in Ottawa

Our approach begins with a thorough assessment. We examine the crown, bark, and trunk for signs of EAB activity, measure the tree's diameter and height, and evaluate overall health. If treatment is viable, we schedule injection during the optimal window when the tree is actively growing and can transport the insecticide through its vascular system. We use certified injection equipment and follow label directions precisely to ensure safety for your property and our crew.

Inspect the tree for EAB symptoms, crown density, and structural integrity.
Drill small holes into the sapwood at a predetermined depth and spacing (typically 10 to 15 centimetres apart around the trunk).
Inject measured doses of systemic insecticide using calibrated equipment.
Seal injection holes with wound dressing or allow them to close naturally, depending on product guidelines.
Clean up all drill debris and document the treatment with photos and notes for your records.
Schedule follow-up assessment in 12 to 24 months to evaluate tree response and plan retreatment if needed.

The entire process typically takes one to two hours per tree. We work safely around power lines, structures, and neighbouring properties, respecting approach distances from your private electrical service entrance.

Real example: A homeowner in Nepean had a 16-metre white ash showing crown thinning and scattered exit holes. We confirmed early-stage EAB infestation and injected TreeAzin in June. The following year, the crown had filled in significantly, and no new exit holes appeared. A second treatment in year two ensured continued protection. Without intervention, that tree would have declined to removal stage within three years.

Treatment Methods and Timing

Method	Description	Best For
Trunk Injection	Systemic insecticide (TreeAzin, Emamectin benzoate) injected into sapwood via small drilled holes; protects tree for one to two years per treatment.	Mature trees with 50+ percent crown cover; trees of landscape or heritage value.
Crown Spray	Foliar insecticide applied to canopy; less common due to application difficulty on tall trees and variable coverage.	Smaller trees (under 10 metres); supplemental treatment alongside injection.
Removal and Replacement	Complete removal of infested tree and planting of EAB-resistant species (oak, maple, birch); permanent solution.	Severely infested trees; trees with less than 50 percent crown; trees blocking views or posing safety risk.
Monitoring Only	Annual or biennial inspection without treatment; document decline and plan removal when tree reaches end-of-life.	Young infested trees; trees already in decline; homeowners planning eventual removal.

Treatment timing is critical. Emerald ash borer injection must occur from late spring to early summer (May through early July in Ottawa) when the tree is actively transporting water and nutrients. Injecting too early or too late reduces efficacy. We schedule treatments based on local bud break and growth stage, not calendar dates alone.

When Treatment Works and When Removal Is Better

Not every infested ash is worth treating. We provide honest advice based on tree health, location, and your goals. A healthy 20-year-old ash with dense crown and early-stage EAB damage is an excellent candidate for injection. A 40-year-old tree already showing 70 percent crown dieback, hollow trunk, or structural defects is not. Treatment costs money and requires commitment to retreatment; removal and replanting may deliver better long-term value. Our arborist report and risk assessment service documents tree condition, EAB status, and treatment viability in writing, which supports any insurance claim or property decision you need to make.

Choose treatment if the tree has dense crown cover, no hollow sections, and high landscape value.
Choose removal if the tree is already 60+ percent declined, poses a hazard to structures, or blocks desired views.
Consider replanting with ash-resistant hardwoods such as oak, sugar maple, or birch native to Ottawa.
Budget for two or three injection cycles (every 12 to 24 months) if you choose treatment; expect total cost of $1,200 to $2,400 for a mature tree over five years.

We also offer ash tree removal and tree planting for homeowners who decide that removal and replacement is the right path forward.

Permits, Safety, and Environmental Responsibility

The City of Ottawa may require a permit for removal of ash trees, depending on size and location. If you are considering removal alongside treatment evaluation, an arborist report supports any permit application and provides the City with professional assessment of tree health and EAB status. We document all treatment work with photographs and notes, which become part of your property record. Our crew respects approach distances from power lines and private electrical service entrances; we never work on the public distribution network operated by your local utility or Hydro One. All injection equipment is cleaned between trees to prevent disease spread, and all drill waste is collected and disposed of responsibly.

We are fully insured and carry liability coverage for all work in Ottawa and the surrounding municipalities. Treatment chemicals are applied according to product label and provincial guidelines, ensuring safety for your family, pets, and the broader environment.

For a free estimate or to discuss whether your ash trees are candidates for treatment, call us at (343) 459-4991 or visit our contact page. We respond to inquiries within 24 hours and schedule site visits at your convenience.

Prices Emerald Ash Borer Treatment in Ottawa — Indicative pricing

Service	Price	Details
Emerald Ash Borer Assessment and Diagnosis	From $150	Inspection, EAB confirmation, and written recommendation for treatment or removal
Trunk Injection Treatment (single tree)	From $400	TreeAzin or equivalent systemic insecticide; typical cost $400–$800 depending on trunk diameter and height
Retreatment (year 2 or 3)	From $350	Follow-up injection to maintain protection; slightly lower cost than initial treatment due to access and tree familiarity
Arborist Report with EAB Assessment	From $250	Detailed written report documenting tree health, EAB status, and treatment viability; supports permit applications and property decisions
Combination: Assessment + Injection + Pruning	From $650	Full service including crown assessment, insecticide injection, and structural pruning to improve tree recovery
Free Estimate	Complimentary	Site visit, tree evaluation, and cost estimate; no obligation; response within 24 hours at (343) 459-4991

Indicative prices; free, personalized estimate within 24h at (343) 459-4991.

Emerald Ash Borer Treatment : service areas

📍 Ottawa 📍 Carleton Place 📍 Mississippi Mills 📍 Arnprior 📍 McNab/Braeside 📍 Beckwith 📍 Montague 📍 Drummond/North Elmsley 📍 Smiths Falls 📍 Perth 📍 Lanark Highlands 📍 North Grenville 📍 Merrickville-Wolford 📍 Clarence-Rockland

Frequently asked questions about Emerald Ash Borer Treatment in Ottawa

What is the emerald ash borer and how does it kill ash trees?

The emerald ash borer (EAB) is a small metallic green beetle native to Asia that arrived in North America around 2002. Adult beetles lay eggs in ash bark crevices; larvae tunnel beneath the bark and feed on the tree's sapwood, disrupting water and nutrient transport. Within two to four years of infestation, an untreated ash tree declines severely and dies. In Ottawa, EAB has spread to nearly every neighbourhood and ravine lot, making early detection and treatment critical for tree preservation.

How much does emerald ash borer treatment cost in Ottawa?

A single trunk injection typically costs between $400 and $800, depending on tree size (trunk diameter) and access difficulty. Mature trees (15 to 20 metres tall) usually fall in the $600–$800 range. Most homeowners budget $1,200 to $2,400 over five years if they pursue multiple retreatments (typically every 12 to 24 months). We provide a free estimate on site; call (343) 459-4991 to schedule your assessment.

Can my ash tree be saved with treatment, or should I remove it?

Treatment works best on trees with at least 50 percent of their crown still intact and no major structural defects. If your ash shows dense foliage, only scattered branch dieback, and early-stage EAB damage (a few exit holes), injection is usually worthwhile. If the crown is already 60+ percent thin, the trunk is hollow, or the tree leans dangerously, removal and replanting is often the better choice. Our ISA Certified Arborists assess each tree individually and give honest advice on whether treatment makes economic sense.

When should I inject my ash tree for emerald ash borer in Ottawa?

Emerald ash borer injection must occur from late spring to early summer (May through early July in Ottawa) when the tree is actively growing and can transport the systemic insecticide through its sapwood. Injecting too early or too late reduces effectiveness. We schedule treatments based on local bud break and growth stage. If you suspect EAB infestation, contact us as soon as possible so we can assess your tree and plan treatment during the optimal window.

What happens if I do not treat my infested ash tree?

An untreated ash tree infested with EAB will decline progressively over two to four years. Branches will thin and die from the top down, the crown will become sparse, and eventually the entire tree will be dead and brittle. Dead ash trees pose a significant hazard: branches fall unpredictably, and the trunk can snap in wind or ice storms. At that point, removal becomes urgent and costly. Early treatment or planned removal avoids sudden emergency situations and gives you control over your property's appearance and safety.

What is the difference between emerald ash borer treatment and ash tree removal?

Treatment preserves your existing tree by injecting systemic insecticide that kills EAB larvae inside the tree; the tree recovers and remains standing. Treatment costs $400–$800 per injection and requires retreatment every 12 to 24 months. Removal eliminates the tree entirely and allows you to plant a new, EAB-resistant species such as oak or maple. Removal is permanent, a one-time cost, and suits trees already in decline or blocking views. We offer both services and help you decide which fits your goals and budget.

How long does an emerald ash borer treatment visit take?

A typical treatment visit takes one to two hours per tree, including assessment, drilling, injection, hole sealing, and cleanup. The actual injection process is relatively quick; most time is spent inspecting the tree, measuring the trunk, positioning equipment safely, and documenting the work. We work efficiently to minimize disruption to your property and schedule multiple trees on the same day when possible to reduce travel time.

Do you offer emergency ash tree removal in Ottawa if a tree becomes hazardous?

Yes, we provide 24/7 emergency tree removal across Ottawa and the surrounding area. If an ash tree or any tree becomes unstable, damaged in a storm, or poses an immediate hazard, call us at (343) 459-4991 anytime. We prioritize safety and respond to emergency calls ahead of routine work. We have the equipment and crew experience to safely remove large trees in tight spaces, around structures, and near power lines.

Is your emerald ash borer treatment safe for my family and pets?

Yes. We use TreeAzin and similar products approved for landscape use in in Ottawa and the surrounding area. These insecticides are applied directly into the tree's sapwood via injection; they do not spray into the air or onto surrounding surfaces. Once injected, the chemical remains within the tree's vascular system. We follow all product label directions and provincial guidelines. Our crew is trained in safe handling and application. Your family and pets can return to normal use of your property immediately after treatment.

Do I need a permit from the City of Ottawa to treat or remove an ash tree?

The City of Ottawa may require a permit for removal of certain trees, depending on size and location. Treatment itself typically does not require a permit. If you are considering removal, we recommend obtaining an arborist report, which documents tree health and supports any permit application. We can prepare this report for you; it provides the City with professional assessment and often expedites the permit process. Rules vary across the Ottawa area and surrounding municipalities, so we always advise checking with your local planning department if you are unsure.

How do I know if my ash tree has the emerald ash borer?

Look for these signs: crown thinning or sparse foliage starting at the top of the tree, dead branches throughout the crown, and small D-shaped exit holes (about 3 millimetres wide) in the bark. You may also see woodpecker damage or tunnelling patterns under loose bark. If you see any of these symptoms on an ash tree in Ottawa, contact us immediately for a free assessment. Early detection significantly improves treatment success and gives you more options for saving the tree.