Emerald Ash Borer Treatment in Windsor is essential protection for ash trees still healthy enough to save. This county is where the borer was first identified in North America, and the surviving ash here are the ones that were treated. Our ISA Certified Arborists assess each tree and deliver trunk-injection treatment during the optimal window from late spring to early summer. If your ash shows no signs of decline yet, treatment now prevents the catastrophic damage that kills thousands of trees across the Windsor area every year. We have been protecting ash since 2014, and we know exactly which trees can be saved and which ones need removal instead. Call us at (855) 510-1827 for a free estimate, or visit our contact page to book an assessment.
Why Emerald Ash Borer Treatment Matters in Windsor
The emerald ash borer has killed millions of ash trees across North America since it arrived in this region. A healthy ash can live another 20 to 40 years with proper treatment, but an untreated tree typically dies within 3 to 5 years of first infestation. Early detection and injection are the only proven way to stop the borer's larvae from girdling the tree from inside. In the Windsor area, where mature ash trees line streets and frame residential lots, losing them changes the entire character of a neighbourhood. Treatment is far less expensive than removal and stump grinding, and it preserves the shade, privacy and property value that established trees provide.
We intervene quickly when you spot the first warning signs:
- Thinning crown or branch dieback starting at the top.
- Vertical cracks in the bark or peeling sections revealing galleries underneath.
- Woodpecker holes or increased woodpecker activity on the trunk.
- New shoots sprouting from the base or lower trunk (epicormic growth).
- Loss of leaves earlier than normal in late summer.
Catching these signs within the first year or two of infestation makes treatment far more likely to succeed. Waiting until the crown is half dead or the tree is already declining rapidly means removal is often the only safe option.
Local fact: In Essex County, ash trees represent roughly 8 to 12 percent of mature street trees and private shade trees. A single untreated ash in Sandwich or Bridgeview can spread borer populations to neighbouring properties within one or two seasons.
How We Assess and Treat Ash Trees
Every ash treatment begins with a thorough inspection. Our certified arborists climb or use binoculars to examine the entire crown, check for gallery patterns in the bark, and assess overall tree vigour. We ask you about any changes you have noticed over the past year or two, because early observation from the ground often catches problems before they become severe. If the tree is a candidate for treatment, we explain the injection method, the timing, and the realistic odds of success based on the tree's current condition.
Treatment involves these concrete steps:
- We drill small access holes around the lower trunk at precise spacing and depth.
- We inject a systemic insecticide (usually emamectin benzoate) into the sapwood using calibrated equipment.
- The tree absorbs the insecticide and distributes it throughout the crown via the vascular system.
- Larvae feeding on treated tissue die before they can complete their life cycle.
- We seal the injection points to prevent disease entry and minimise wound stress.
- We schedule follow-up treatments every 1 to 2 years for as long as the borer pressure remains high in the area.
Treatment is most effective from late spring through early summer, when the tree is actively growing and the borer larvae are actively feeding. Injecting too early or too late in the season reduces uptake and effectiveness. We plan your schedule accordingly and send you a reminder when the next injection window opens.
Real example: A 40-year-old green ash in Windsor with early crown thinning and a few bark cracks typically costs $400 to $650 for the first injection, then $300 to $500 for each follow-up every 2 years. A large ash over 60 centimetres in diameter or in a confined space may cost more. Compare that to $1,200 to $2,500 for removal and stump grinding of the same tree.
Treatment Methods and When to Use Them
Not every ash needs the same approach. Tree size, location, condition, and your long-term goals determine which method we recommend. Below is a summary of the main options we offer across the Windsor area.
| Method | Description | Best For |
|---|---|---|
| Trunk Injection | Emamectin benzoate injected into sapwood via drilled ports; systemic uptake protects the entire crown for 1 to 2 years. | Healthy to moderately declining ash; backyard or street trees where preservation is the goal. |
| Bark Spray Application | Pyrethroid or other contact insecticide sprayed on the bark to kill emerging adult borers; less systemic, requires annual application. | Prevention on young or high-value ash; supplementary treatment alongside injection for heavily infested trees. |
| Removal and Replacement | Tree is felled, stump ground out, and a disease-resistant species is planted in its place. | Severely declining ash; trees already 50 percent or more dead; ash in confined spaces where removal is safer than treatment. |
| Monitoring Only | Regular visual inspections without active treatment; document changes and decide on action if decline accelerates. | Young, vigorous ash with no current symptoms; ash in low-priority locations; trees you wish to observe before committing to treatment cost. |
We discuss all options during your free estimate and help you decide based on the tree's health, your budget, and how much you value that particular tree for shade or aesthetics.
Permits and Safety Around Your Property
Emerald ash borer treatment itself does not typically require a municipal permit in Windsor or the surrounding municipalities, since the tree remains standing and the work is minor. However, if your ash is large or in a sensitive location, and you are considering removal as an alternative, the City of Windsor may require a permit for a private tree removal. We can support that application with an arborist report documenting the tree's condition and the borer infestation. Our ISA Certified Arborists prepare these reports to the standard expected by municipal staff, and they streamline the approval process. Visit our arborist report page for details.
During injection work, we respect all approach distances near your private electrical service entrance (the wire from the pole to your house). We never work on or near the public distribution network operated by your local utility or Hydro One. If your ash is touching those lines, we refer the situation to your utility and focus only on safe clearance work around your private equipment.
We are a fully insured local company. Our crews carry liability coverage and hold current ISA Certification. We clean up all debris and dispose of it responsibly, either through chipping for mulch or delivery to a licensed facility.
Timing and Seasonal Considerations
Emerald ash borer injection is most effective from late spring to early summer, when the tree is actively growing and uptake of the systemic insecticide is at its peak. In the Windsor area, we typically schedule injections from May through early July. Injecting too early (before leaf-out) or too late (after midsummer) reduces the chemical's distribution and lowers survival rates for treated trees. We plan your first treatment within this window and arrange follow-up injections every 1 to 2 years as long as borer pressure remains high in the county.
If you notice borer symptoms in late summer or autumn, we assess the tree immediately and plan the injection for the following spring. Waiting 6 to 8 months is far better than injecting at the wrong time of year. We also offer tree disease diagnosis year-round if you are unsure whether your ash is infested or simply stressed by drought or other factors.
Cost and Return on Investment
Emerald ash borer treatment costs far less than removal and stump grinding, and it preserves a tree that may have decades of life remaining. A single injection typically ranges from $350 to $700 depending on tree size and site access. Follow-up injections every 1 to 2 years cost $300 to $550. By contrast, removal of a mature ash, stump grinding, and site restoration often totals $1,500 to $3,000 or more. Over 10 years, keeping a tree alive through periodic treatment is almost always the better financial choice. Beyond cost, a mature ash provides irreplaceable shade, privacy, and character that a young replacement tree cannot match for decades.
We offer a free estimate for every ash on your property. Call (855) 510-1827 or use our online contact form to book. We will examine the tree, explain your options, and provide a clear price for treatment if that is the right choice. If removal is more appropriate, we can discuss that as well and offer pricing for ash tree removal or tree planting to replace it with a species resistant to the borer.
Prices Emerald Ash Borer Treatment in Windsor — Indicative pricing
| Service | Price | Details |
|---|---|---|
| Small ash (under 30 cm diameter), first injection | From $350 | Early-stage infestation, good crown health, straightforward access |
| Medium ash (30 to 60 cm diameter), first injection | From $500 | Moderate infestation, typical Windsor backyard or street tree |
| Large ash (over 60 cm diameter), first injection | From $700 | Mature tree, confined space, or advanced borer activity requiring extra ports |
| Follow-up injection (any size), subsequent years | From $300 | Maintenance treatment every 1 to 2 years to sustain protection |
| Free estimate and assessment | Complimentary | On-site inspection, diagnosis, and treatment plan; response within 24 hours at (855) 510-1827 |
Indicative prices; free, personalized estimate within 24h at (226) 602-8703.
