You have probably seen the phrase "certified arborist" on trucks around Fort Wayne and Marion. Maybe someone told you to call one. But what does that actually mean? Is it just a fancy title, or does it represent something real? Here is what the certification means and why it matters when your trees need plant health care.
What ISA Certification Means
The International Society of Arboriculture (ISA) is the main professional organization for tree care worldwide. Their Certified Arborist credential is not a license you buy. It requires passing a comprehensive exam covering tree biology, soil science, plant health care, pest and disease management, and safety.
To qualify for the exam, candidates need at least three years of full-time experience in arboriculture or a combination of education and experience. The exam itself covers topics from Purdue Extension's tree care publications and other research-based sources. It is not easy to pass.
Once certified, arborists must earn continuing education credits every three years to maintain the credential. This means they stay current on new research, pest outbreaks, and best practices. The ISA revokes the certification if the education requirements are not met.
What We Actually Do (and What We Don't)
First, the honest part. We do not do tree climbing, pruning, or removals. That is a different trade with different equipment and different risks. What we do is plant health care — the science of keeping trees and shrubs healthy, diagnosing what is wrong when they are not, and treating insect and disease problems before they kill the plant.
Anyone with a chainsaw and a truck can call themselves a "tree service." Indiana does not require a license to cut down trees. A certified arborist who specializes in plant health care brings something different to the property:
Diagnosis. When a tree looks sick, we can tell you why. Is it scale? Spider mites? Bagworms? A leaf or canker disease? A nutrient deficiency? Root stress from compacted clay or last year's drought? The diagnosis determines the treatment, and a wrong diagnosis means wasted money and a dying tree. Purdue Extension's diagnostic guides are written for professionals trained to read these symptoms in context.
Insect control. Many of the worst pests in northeast Indiana — emerald ash borer, bagworms, Japanese beetles, scale, spider mites, aphids — have narrow treatment windows tied to their life cycle. Our team times our trunk sprays, foliar treatments, and basal drenches to hit each pest when it is vulnerable, not when it is convenient.
Disease treatment. Apple scab, anthracnose, needle cast, fire blight, and other landscape diseases are managed with specific fungicides applied at specific phenological stages. Get the timing wrong and the spray does nothing. We track that for you.
Deep root fertilization. Most landscape trees in our area are growing in compacted, low-organic-matter soil that does not feed them well. We inject a slow-release fertilizer blend directly into the root zone, bypassing the lawn and putting nutrients where the tree can actually use them.
Emerald ash borer protection. EAB has reshaped the canopy of nearly every neighborhood in Fort Wayne and Marion. Mature ash trees can be protected with trunk injections if the tree is still healthy enough to translocate the treatment. Purdue Extension's EAB resources are clear on this: the decision needs to be made before the tree shows serious decline, not after.
When You Should Call an Arborist
A tree looks sick and you do not know why. Yellow leaves, thinning canopy, early fall color, sticky residue on the leaves below, white or gray crust on the bark, holes in the trunk, dieback at the tips. These are all symptoms that need professional diagnosis before they progress.
You have an ash tree you want to keep. If it is still healthy, it is a candidate for treatment. If you wait until you see crown thinning and D-shaped exit holes, you have probably waited too long.
You see scale, bagworms, or webbing on a tree or shrub. These pests can defoliate evergreens and weaken hardwoods in a single season. Most are treatable, but only inside a specific window each year.
You planted a tree in the last few years and it is not thriving. Young trees in our clay soils often need help establishing. Deep root fertilization and a basal drench for borers and chewing insects can be the difference between a tree that takes off and a tree that limps along.
You have flowering trees, fruit trees, or specimen plants you care about. Crabapples, dogwoods, magnolias, Japanese maples, blue spruce, boxwood — these all have predictable disease and insect issues in northeast Indiana, and a yearly plant health care program keeps them ahead of trouble instead of behind it.
How to Verify Someone's Credential
The ISA maintains a searchable directory of certified arborists at treesaregood.org. You can search by zip code to find credentialed professionals in the Fort Wayne and Marion areas.
When you call any company, ask for their ISA credential number. You can verify it on the ISA website. Also ask about insurance. A reputable arborist carries both liability insurance and workers' compensation. Ask for certificates, not just a verbal promise.
Be cautious of anyone who shows up uninvited after a storm offering cheap work, or who promises to "feed" or "treat" a tree without first looking at it carefully. These are red flags that Purdue Extension and the ISA both warn about.
What an Assessment Costs
For homeowners who are not already on one of our plant health care programs, we charge $65 for an on-site arborist assessment. That gets you a walk-through with one of our certified arborists, a diagnosis of whatever is going on with the tree or shrub, and an honest treatment recommendation. Current customers do not pay for assessments — that is part of being on a program with us.
Why a Plant Health Care Program Pays
One-off treatments are sometimes all a tree needs. But for the trees you care about most — the shade tree over the patio, the row of arborvitae screening the road, the ash you are not ready to lose — a yearly plant health care program is almost always the better deal.
Removing a large tree costs thousands of dollars and takes decades to replace. A few hundred dollars a year in well-timed insect, disease, and root treatments is small money in comparison. That math is why our spring and summer rounds book up early, especially for ash injections, scale treatments, and deep root fertilization.