What Does an Arborist Do?

An arborist is a tree care professional who knows how trees grow, get sick and fail. So an arborist does far more than cut trees down. For example, the job includes health checks, disease and pest diagnosis, and careful pruning. It also covers soil care, risk reviews, cabling and safe removals.

People use the word "arborist" loosely. Sometimes it means anyone who climbs trees. More precisely, it means someone trained in tree biology, health and risk. This guide explains what that work involves and when you need it.

What is the core of an arborist's job?

The core of the job is keeping trees healthy and safe where they grow. That's broader than it sounds. After all, trees are large, long-lived living things. They interact with soil, weather, pests, disease and everything built around them.

Managing them well means understanding all of that, not just the part above ground. Here are the main services, one by one.

Tree health assessment

A health assessment is a careful check of a tree's condition. The arborist examines the crown, trunk, bark, root collar and site. Then they look for disease, pests, decay, weak structure and soil problems.

Afterward, you get a clear picture of what's going on and what your options are. Without that, you're guessing. Our tree health assessment guide explains what a professional check involves.

Structural pruning and risk reduction

Pruning with tree knowledge is different from general cutting. An arborist knows how each cut affects the tree's structure, energy and healing. So they remove the right branches, at the right spots, for the right reasons.

That includes shaping young trees for strong structure, crown thinning and deadwood removal on mature trees. It also includes crown reduction and pre-storm work on the limbs most likely to fail. See our tree trimming and pruning services for more.

Disease and pest diagnosis

Many diseases and pests leave clear clues. For example, look for bark patterns, cankers, dieback, mushrooms or insect tunnels in the wood. Spotting them early changes what's possible. Some problems that are hopeless later respond well when someone catches them early.

Some threats are especially serious in New York. For instance, the NYS Department of Environmental Conservation tracks oak wilt, a fungal disease that sap beetles carry between oaks. Our guide to common tree diseases in NY covers the ones most relevant to Dutchess County.

Soil and root health work

Yard trees often grow in soil very unlike a forest floor. Construction compacts the subsoil, and grade changes bury the root flare. Pavement and packed lawns also block water and air. As a result, the tree suffers slow, chronic stress for years.

So soil work tackles those root causes. Deep root fertilization is one tool, and aeration and mulching are others. Our deep root fertilization guide explains the most common approach.

Risk assessment and documentation

A tree risk assessment weighs how likely a tree is to fail against what it would hit. It's more formal than a general health check. The International Society of Arboriculture's Recognizing Tree Risk guide agrees. Judging how serious a defect is, it says, "is best done by a professional arborist."

You might want a formal risk review in these cases:

• a large tree over your house, where you want a documented decision;
• a neighbor dispute about a tree on or near the line;
• an insurance claim or a property sale where the tree's condition is in question;
• any time you want a professional opinion on record.

Tree cabling and bracing

Some trees have structural defects that would otherwise mean removal. In those cases, cables in the upper crown or rods through a split stem can reduce risk. That way, you keep a tree you value.

Even so, it's not a cure-all. The same guide notes that such supports "are not guarantees against failure." For details, see what tree cabling is for how the systems work.

Tree removal planning

When removal is the right answer, doing it well is a skilled job of its own. That's especially true near houses, in tight spaces or with rotten wood. Tree knowledge shapes the cutting order, the rigging plan and how the crew protects the site.

Shawn's crew works with a bucket truck and a boom truck. Both help on tight or tricky removals. Equipment, however, is only half of it. Still, the plan matters just as much.

What sets arborist work apart from general tree cutting?

The key difference is diagnosis, because an arborist understands what a tree needs and why. They can also spot problems you can't see from the street. A general crew, by contrast, can cut wood efficiently.

The two overlap a lot, and many skilled crews know both sides. But the difference matters when you need these things:

• a diagnosis instead of a plan you already decided on;
• work that protects the tree's long-term health;
• documentation of findings and recommendations;
• an honest opinion, rather than one driven by what the job pays.

Besides, good advice often comes with the work. Sandy E. wrote, "Shawn also shared some valuable resources with me that I had been searching for, which was an unexpected bonus."

GXB Precision Tree Care provides tree health and assessment services across Dutchess County. Request an assessment and we'll look at your trees and tell you what we find.