Tree Service · Treatments

Tree treatments

A tree treatment is worth buying when it follows a specific diagnosis: a named pest, a named pathogen, a soil test result, or a structural defect an arborist can point at. The International Society of Arboriculture frames plant health care as using "the most cost-effective and environmentally sensitive practices." Treatments sold on a recurring schedule with no diagnosis behind them are a subscription, not medicine.

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The legitimate treatment categories are narrow. Cabling and bracing installs hardware to support a structurally weak union — a codominant fork with included bark, for example — and it is covered by the ANSI A300 standards. It is a real intervention with a real inspection schedule attached. Targeted pest and disease treatment follows an identification. Soil and root work — decompaction, correcting a girdling root, proper mulching — addresses causes rather than symptoms.

ISA's guidance on diagnosis is the useful filter: when abnormalities appear, an arborist should "help identify the specific symptoms and try to diagnose the problem and select an appropriate treatment." Note the order. Symptom, diagnosis, then treatment. Any proposal that arrives in the reverse order — here is our annual program, it will help — has skipped the part you are paying for.

"Deep root fertilization" is the most commonly oversold service in this trade. Fertilizer corrects a nutrient deficiency. If nobody has tested your soil, nobody knows whether you have one, and trees in a fertilized lawn frequently do not. Ask for the soil test result. If there isn't one, ask why you are being sold the remedy before the diagnosis.

Cabling deserves one specific warning: it is not a permanent fix and it does not make a failing tree safe forever. Hardware needs periodic inspection, and a cabled tree still has the defect it had before. Ask what the inspection interval is and who pays for it. If the honest answer to "can this tree be made safe" is no, removal is the answer even though it pays the contractor more.

How to choose

No diagnosis, no treatment: Ask what the pest or pathogen is by name, or what the soil test showed. A specific answer means someone actually looked.
Ask for the soil test before fertilization: This one question ends most deep-root-fertilization sales conversations.
Get cabling specified to ANSI A300: The standard covers supplemental support systems. Ask what hardware, at what height, and what the reinspection interval is.
Ask what happens if you do nothing: A good arborist will tell you honestly. Sometimes the answer is "probably nothing for five years," and that is a legitimate plan for a tree that isn't over anything.
Ask about non-chemical options first: Mulching, watering during drought, and root-zone protection fix more tree problems than injections do, and they are far cheaper.

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FAQ

Tree Service treatments — common questions

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Is deep root fertilization worth it?

Only with a soil test showing a deficiency. Fertilizer is a treatment for a specific problem, not a tonic. Trees growing in a regularly fertilized lawn are often already receiving nutrients. Ask what the test showed before you agree to a program.

Can cabling save a split tree?

Sometimes, for a weak union that has not failed yet. Cabling and bracing are covered by ANSI A300 supplemental support standards. It does not remove the defect, it manages it, and the hardware requires periodic inspection. Ask for the reinspection schedule in writing.

How do I know a treatment is legitimate?

It names a specific problem. "Scale insects on the lower branches, confirmed by sample" is a diagnosis. "Your trees are stressed, our program will help" is not. ISA's guidance is to identify symptoms, diagnose, then select treatment — in that order.

Are annual tree health programs a good idea?

For a valuable mature tree with a known ongoing issue, monitoring on a schedule makes sense. For healthy trees with nothing wrong, you are buying a truck visit. Ask what specifically will be assessed and what triggers a treatment.

Sources

Where these figures come from

ISA — Plant Health Care · retrieved 2026-07-26
ISA — ANSI Standards · retrieved 2026-07-26