7 Warning Signs Your Tree Needs Removal in Buffalo NY (2026)

A slight natural lean — one that has been consistent for years — is not necessarily a problem. Many trees grow at a gentle angle in response to light or prevailing wind and are perfectly stable. What is a serious warning sign is a sudden change in lean — a tree that was upright last week and is now noticeably tilted — or a lean that is increasing progressively over weeks.

Sudden leaning almost always indicates root failure or a break in the structural wood at or near the base. The tree is essentially beginning to fall — it’s just doing it slowly. If the lean is toward a structure, power line, vehicle, or occupied area, this is a same-day emergency. Do not wait for a storm to trigger the final failure.

Surface cracks from bark expansion or frost cracking are relatively common in WNY and don’t necessarily indicate structural failure. The cracks that signal serious problems are deep, wide cracks that extend into the wood itself — particularly cracks that are vertical and run along the length of the trunk, or cracks where the two sides of the crack show relative movement.

Co-dominant stems — where a trunk splits into two roughly equal vertical stems — are a particularly high-risk configuration. The attachment point between co-dominant stems is structurally weak, and storms or snow loads frequently cause one stem to split away from the other, often catastrophically. This is one of the most common causes of major property damage from trees in Buffalo.

Dead branches — called “widow makers” in the arborist community for obvious reasons — are one of the most underestimated hazards in residential trees. Unlike living wood, dead branches don’t bend under load — they snap. And they snap without warning, in calm conditions as readily as in storms. A large dead branch over a roof, driveway, walkway, or play area is a genuine ongoing hazard every day it remains in place.

The key question isn’t just whether branches are dead — it’s what percentage of the canopy is dead and where the dead wood is located. A small amount of dead wood in an otherwise healthy tree is normal and manageable with pruning. When more than 25–30% of the canopy is dead, particularly when the dead wood is in the upper crown or main scaffold branches, the tree’s long-term structural integrity is compromised and removal is often the right answer.

Mushrooms, bracket fungi (shelf fungi), or conks growing from the base of a tree trunk or from the root flare are serious indicators of internal wood decay. These fruiting bodies are the above-ground part of a much larger fungal network that has been decomposing the tree’s structural wood — often for years before the fruiting bodies appear. By the time you see mushrooms at the base, significant internal decay is almost always already present.

Different fungal species indicate different types of decay. Honey mushrooms (Armillaria) indicate root and butt rot. Ganoderma (artist’s conk) indicates white rot of the heartwood. Chicken of the woods (Laetiporus) indicates significant wood breakdown. All of these are concerning — an ISA-certified arborist can assess the extent of the decay and whether it has compromised the tree’s structural integrity enough to justify removal.

The root system is the tree’s foundation. When roots are compromised — by construction damage, disease, soil compaction, or mechanical injury — the tree loses the anchor system that keeps it upright under wind and load. Signs of root failure include: soil lifting or cracking in a curved line around the base (the root plate beginning to lever up), exposed roots that show cuts or damage, and sudden soil settlement near the base.

Root problems are particularly deceptive because the tree can look completely healthy above ground while the anchorage system has been significantly degraded below. A tree with severe root damage can fail in a moderate wind event that a healthy tree would handle easily — and the failure is typically sudden and complete, not gradual.

A hollow tree is not automatically a removal candidate — some trees with partial hollowing have maintained structural integrity through a thick outer shell of sound wood. But the extent of the hollow matters critically. Arborists use the “one-third rule” as a general guideline: if the hollow or decayed area represents more than one-third of the trunk’s diameter, the tree’s structural integrity is significantly compromised.

Signs of a hollow or internally decayed trunk include: visible cavities where wood has fallen away, bark that sounds hollow when knocked, carpenter ants (who colonize decayed wood) trailing in and out of the trunk, or advanced woodpecker excavation on the trunk indicating the wood inside is soft and beetle-infested.

A tree that has been significantly damaged in a storm — major limbs torn away, partial trunk split, tree partially uprooted — requires immediate professional assessment. Storm-damaged trees create two categories of risk: the immediate hazard of unstable hanging wood and the longer-term structural compromise from the damage itself. Both need to be evaluated by a professional, not assessed by looking at the tree from the ground.

Partially fallen trees — particularly “widow makers” caught in the canopy of neighboring trees — are among the most dangerous situations in tree work. The stored energy in a tree hanging at angle in another tree is enormous and unpredictable. Never attempt to deal with a hung-up tree without professional equipment and expertise.

The Emerald Ash Borer has killed tens of thousands of ash trees across Erie and Niagara counties. Because EAB is so prevalent in WNY, ash tree owners need to know the specific signs of infestation — which differ from the general warning signs above. Look for: upper canopy dieback (sparse crown starting at the top), woodpecker damage creating blond vertical strips on the bark, D-shaped exit holes about 1/8 inch wide in the trunk and branches, epicormic shoots sprouting from the lower trunk, and S-shaped galleries visible beneath peeling bark.

The key difference with EAB-affected ash trees: the tree may still appear to have leaves on the lower branches while the upper crown is dead. Do not wait for the tree to be fully dead — a dead ash tree costs significantly more to remove than one caught while still declining, and dead ash wood cannot be safely climbed, often requiring crane assistance.