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.
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.
Choosing tree service treatments
The judgement calls that decide the bill, before anyone quotes you.
- 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.
All tree service treatments
Tree Disease Treatment Guide
Insect Infestation Tree Treatment
Tree Fertilization Programs
Root Zone Treatment
Systemic Tree Treatments
Oak Wilt Management Basics
Emerald Ash Borer Tree Response
Where these figures come from
Sources last checked
- ISA - Plant Health Care · retrieved 2026-07-26
- ISA - ANSI Standards · retrieved 2026-07-26
You know more than the last homeowner they quoted.
That is worth something only while you are still choosing. Tell us what is going on and we will match you with a few tree service pros whose licence and insurance we have already checked - free, no obligation.
Free · No pressure · Only your matched pros get your details