Tree Health & Disease Care — Diagnose, Then Treat.
A struggling tree is trying to tell you something. Our ISA Certified Arborists diagnose disease, decline, and stress — then give you an honest plan to save it where we can.
Free Health Assessment
Same-day assessment. No obligation, no surprise fees.
Most tree problems are fixable — if you catch them early.
Yellowing leaves, thinning canopies, oozing bark, early leaf drop — these are symptoms, not diagnoses. Treating the wrong cause wastes money and can make things worse.
We assess the whole tree and its environment — soil, roots, pests, disease, and stress — to find the real cause, then recommend a clear, proportionate plan.
Sometimes that means pruning and soil care, sometimes a treatment we will point you to a licensed applicator for, and occasionally, honestly, removal. Either way you get the truth rather than a sales pitch.
Warning signs to watch
- Yellowing, browning, or undersized leaves
- A thinning canopy or dead patches
- Early or out-of-season leaf drop
- Oozing, cankers, or peeling bark
- Mushrooms or fungus on the trunk or roots
- Sudden lean or soil heaving at the base
A Real Diagnosis, Then a Plan
Certified assessment of the whole tree — not a guess and a quote.
- Full health assessmentA certified arborist evaluates canopy, trunk, roots, and site conditions.
- Cause diagnosisWe identify the actual problem — pest, disease, soil, or stress.
- Written care planClear recommendations and priorities you can understand.
- Pruning for healthRemoval of diseased or dead wood to help the tree recover.
- Soil & root guidanceAdvice on mulching, watering, and root-zone care.
- Honest prognosisIf a tree can’t be saved safely, we’ll tell you plainly.
Tree Health & Disease: The Details Homeowners Ask For
Straight answers on timing, permits, access, and what it costs you.
- What a diagnosis visit covers
- Species, the canopy from the ground up, the trunk and root flare, the soil, and the site history. Most tree problems in a city yard start below ground.
- What we see most in North York
- Tar spot and anthracnose on maples in a wet spring, needle cast on blue spruce, verticillium wilt on maples and ash, girdling roots on street-side trees, and salt burn along driveways.
- The two we watch for
- Dutch elm disease on the remaining mature elms, and oak wilt, confirmed in Ontario in 2023. Both spread through beetles drawn to fresh cuts and through root grafts between neighbouring trees.
- What we treat with
- Pruning, mulch, water and compaction relief. We are arborists rather than exterminators, so where a diagnosis calls for a fungicide we say so and point you to a licensed applicator.
- Soil work
- Compaction relief and mulch first. Feeding only where a soil test says something is actually missing, since most urban tree decline is water and air, not nutrients.
- Best time of year
- Symptoms read most clearly in full leaf, June through August. Structural defects show best with the leaves off.
- Winter injury
- A frost crack is a vertical split down the sunny side of a trunk after a hard freeze, and sunscald is the dead bark strip that follows on young, thin-barked trees. Neither needs sealing. Both are worth watching for decay later.
- Typical job length
- An hour on site for an assessment. Treatment schedules depend on what we find.
The urban problems that look like disease and are not
A stem girdling root is the quiet killer of city trees. A root that circles the trunk instead of running away from it tightens as both grow, until it squeezes the tissue carrying sugar down to the roots. The tree thins from the top, leafs out late, and colours early in fall. The tell is a trunk that goes into the ground like a telephone pole instead of flaring out at the base. Caught early, we can excavate the flare and cut the offending root.
Compaction does the same job slower. Roots need air, and the top 30 cm of soil under a lawn that gets driven on, parked on, or walked over daily holds very little. That is why the maple beside the driveway fails first while the one in the back garden thrives.
Road salt burns from two directions in North York: spray thrown off the road onto branches, and runoff soaking into the root zone at the end of a driveway. Salt-damaged conifers brown on the road-facing side only, which distinguishes it from disease. Flushing the root zone with water in early spring helps, and choosing a salt-tolerant species helps more.
Tar spot on Norway maples looks alarming and matters least of anything on this list. Black spots the size of a coin, thousands of them, no effect on the tree’s health. Raking and binning the leaves in fall reduces next year’s crop.
The North York Tree Standard
The same proven four steps on every job.
Call or Request a Quote
Tell us about the tree. Emergencies answered 24/7.
Free On-Site Assessment
A certified arborist confirms the plan and gives a written price.
Safe, Insured Treatment
Carried out by an equipped, fully insured crew.
Spotless Cleanup
Everything hauled away — your yard left clean and safe.
Caught Early, Turned Around
A few recent North York jobs — handled safely and cleaned up completely.
Thinning, yellowing birch
A declining birch the owners feared was dying.
Stressed maple in compacted soil
A maple struggling in hard, compacted ground.
Oak with advanced root rot
A large oak with fungus and internal decay.
“Our birch looked like it was on its way out. Instead of just quoting a removal, the arborist figured out what was wrong, treated it, and a season later it’s thriving again.”
Worried about a sick tree?
Get a certified diagnosis and honest plan across North York & the GTA. Free assessment.
Questions Homeowners Ask Us
Can you tell what’s wrong with my tree?
In most cases, yes. A certified arborist assesses the canopy, trunk, roots, and site to identify the real cause rather than guessing from one symptom.
Can a sick tree be saved?
Often, if caught early. Most urban tree decline traces back to roots, water and compaction rather than disease, and those are fixable without a single chemical. We give you a realistic prognosis either way.
Do you spray or inject trees?
No. Pesticide and fungicide application in Ontario is licensed work and we do not sell it. We diagnose the problem, do the pruning and soil-side work ourselves, and tell you plainly if the answer is a treatment a licensed applicator should carry out.
How do I keep my trees healthy?
Proper mulching, watering during drought, avoiding root-zone compaction, and periodic pruning go a long way. We’ll give you a simple care plan.
What if the tree can’t be saved?
We’ll tell you honestly and, if it’s a hazard, recommend safe removal — never an unnecessary one.
What is killing the elms and oaks around Toronto?
Dutch elm disease has been taking mature elms for decades, and oak wilt was confirmed in Ontario in 2023. Both are fungal, both are carried by beetles attracted to fresh wounds, and both move underground between trees whose roots have grafted. It is the reason we hold elm and oak pruning to the cold months.
My spruce is going brown from the bottom up. What is it?
On blue spruce in this area that is usually rhizosphaera needle cast, a fungus that takes the older inner needles first and works upward. It responds over a few seasons to fungicide timed to the new growth, applied by a licensed applicator, alongside pruning for airflow and spacing, which is the part we handle.
Does my tree need feeding?
Probably not. Most declining city trees are short of air and water at the roots rather than nutrients, and pushing growth on a stressed tree makes things worse. We start with compaction relief and mulch, and test before recommending anything else.
The salt from the road is browning my cedars. Can anything be done?
Flush the root zone deeply in early spring to move salt past the roots, screen the road-facing side over winter, and replace losses with salt-tolerant species. Damage that shows only on the road side is the signature of spray rather than disease.