# Certified Arborist Westchester NY | Tree Health & Disease | Westchester Tree Pros > On-site tree health assessments & disease diagnosis in Westchester County, NY. EAB, oak wilt, spotted lanternfly & structural risk. Certified arborist. Free estimates. URL: https://westchestertreepros.com/tree-health-assessment/ ![Tree Health Assessments & Disease Diagnosis](/images/hero/certified-arborist-examining-a-mature-tree-with-no.webp) Service # Certified Arborist Tree Health Assessments in Westchester County On-site evaluations to diagnose disease, pest infestation, and structural risk, with treatment or removal recommendations. Call 914-907-4131 [tel:+19149074131 →](tel:+19149074131) Get a Free Estimate [/contact/ →](/contact/) **From $150 – $500 per assessment** · Fully insured · Cleanup included · Free on-site estimate Last Updated: July 18, 2026 ★ 4.9 Google Rating ✓ Fully Insured ✓ Same-Day Response ✓ Free Itemized Estimate ## About Our Tree Health Assessments & Disease Diagnosis Service in Westchester Not every troubled tree needs to come down. Our certified arborists perform on-site evaluations to diagnose disease, pest infestation, and structural risk — including regional threats like emerald ash borer, oak wilt, spotted lanternfly, and beech leaf disease. You get a clear treatment-or-removal recommendation backed by Tree Risk Assessment Qualification (TRAQ) methodology. ![Tree Health Assessments & Disease Diagnosis in Westchester County](/images/features/close-up-of-arborist-inspecting-bark-for-emerald-a.webp) ## What's Included in Every Tree Health Assessments & Disease Diagnosis Job - On-site disease and pest diagnosis - Structural risk assessment (TRAQ) - Emerald ash borer and regional pest evaluation - Treatment vs. removal recommendations - Certified arborist credential ## Diagnose Before You Decide Removing a valuable mature tree is a big call. Our certified arborist assessment gives you the information to make the right one — often, treatment or monitoring saves a tree that a general tree service would tell you to remove. ## Regional Threats We Look For - **Emerald ash borer (EAB)** — D-shaped exit holes, upper-canopy dieback in ash - **Oak wilt** — rapid crown wilt in oaks; contagious via vascular system - **Spotted lanternfly** — nymphs and adults, especially on tree of heaven and hardwoods - **Beech leaf disease** — banding between leaf veins, defoliation - **Root rot (Armillaria)** — mushroom clusters at the base, canopy decline ## Structural Assessment Not all problems are pests. We use TRAQ methodology to evaluate: - Trunk cracks, cavities, and decay - Root flare and soil heave - Co-dominant stems and weak unions - Lean angle and change over time - Proximity to structures and lines ## The Report You get a written report with observations, risk rating, and specific recommendations — treatment, monitoring, structural support ( cabling and bracing [/tree-cabling-bracing/ →](/tree-cabling-bracing/) ), or removal [/tree-removal/ →](/tree-removal/) . No pressure, no upsell. Related guides: common tree diseases in Westchester [/guide/common-tree-diseases-westchester/ →](/guide/common-tree-diseases-westchester/) , emerald ash borer signs [/guide/emerald-ash-borer-signs/ →](/guide/emerald-ash-borer-signs/) , when to call a certified arborist [/guide/when-to-call-a-certified-arborist/ →](/guide/when-to-call-a-certified-arborist/) . ## Coverage Area Our certified arborists assess trees across all of Westchester County [/service-areas/ →](/service-areas/) and the surrounding 25-mile radius, including Scarsdale [/service-areas/scarsdale/ →](/service-areas/scarsdale/) , Bronxville [/service-areas/bronxville/ →](/service-areas/bronxville/) , Larchmont [/service-areas/larchmont/ →](/service-areas/larchmont/) , New Rochelle [/service-areas/new-rochelle/ →](/service-areas/new-rochelle/) , Chappaqua [/service-areas/new-castle/ →](/service-areas/new-castle/) , and White Plains [/service-areas/white-plains/ →](/service-areas/white-plains/) . Our Process ## How Our Westchester Tree Service Works 01 ### Free On-Site Estimate A certified arborist assesses the tree, hazards, and access. 02 ### Itemized Quote You get a clear, all-in-one price with no hidden cleanup fees. 03 ### Safe Work OSHA-compliant crew with full insurance handles the work. 04 ### Complete Cleanup We haul debris and leave your property tidy on every job. Recent Work ## Recent Tree Health Assessments & Disease Diagnosis Projects in Westchester ![Tree Health Assessments & Disease Diagnosis project in Westchester County](/images/features/close-up-of-arborist-inspecting-bark-for-emerald-a.webp) ![Tree Health Assessments & Disease Diagnosis project in Westchester County](/images/features/arborist-with-clipboard-recording-traq-risk-assess.webp) ![Tree Health Assessments & Disease Diagnosis project in Westchester County](/images/features/spotted-lanternfly-adult-on-tree-trunk-in-a-westch.webp) ![Tree Health Assessments & Disease Diagnosis project in Westchester County](/images/features/homeowner-and-arborist-discussing-treatment-recomm.webp) ## Need Health Assessment? Free, on-site estimates across Westchester County. Call 914-907-4131 for an insured, local team that shows up when we say we will. Call 914-907-4131 [tel:+19149074131 →](tel:+19149074131) Free Estimate [/contact/ →](/contact/) FAQ ## Tree Health Assessments & Disease Diagnosis Questions Westchester Homeowners Ask ### When should I call an arborist for an assessment? + When you notice unexplained canopy dieback, a new lean, cracks, pest signs, or before a big removal decision. Also for pre-purchase property inspections. ### What is TRAQ? + Tree Risk Assessment Qualification — an ISA methodology for rating tree failure risk. Our team is TRAQ-certified. ### Can you save a tree with pest damage? + Sometimes — depends on the pest, timing, and extent. Emerald ash borer, for example, is treatable if caught early enough. ### Do you charge for the assessment? + Standard estimates for removals or pruning are free. Detailed diagnostic assessments with a written report have a fee starting at $150. ### Which tree pests and diseases are common in Westchester? + The big regional threats are emerald ash borer, oak wilt, spotted lanternfly, and beech leaf disease. Our certified arborists diagnose these on site and recommend treatment or removal based on how far the problem has progressed. Learn More ## Tree Health Assessments & Disease Diagnosis Guides Guide ### Common Tree Diseases and Pests in Westchester Regional tree threats in Westchester — emerald ash borer, oak wilt, spotted lanternfly, beech leaf disease, boxwood blight — with symptoms and when to call an arborist. Read guide → [Common Tree Diseases and Pests in Westchester →](/guide/common-tree-diseases-westchester/) Guide ### Emerald Ash Borer: Signs and What to Do How to spot emerald ash borer on your ash trees, the treatment vs. removal window, the risk to nearby trees, and when to book an inspection. Read guide → [Emerald Ash Borer: Signs and What to Do →](/guide/emerald-ash-borer-signs/) Guide ### When to Call a Certified Arborist for a Tree Inspection The trigger signs that warrant a certified arborist inspection, what an assessment covers, TRAQ risk rating, and how an arborist differs from a tree cutter. Read guide → [When to Call a Certified Arborist for a Tree Inspection →](/guide/when-to-call-a-certified-arborist/) Related Services ## Other Westchester Tree Services You May Need ![Tree Cabling & Bracing](/images/hero/arborist-installing-dynamic-support-cable-between-.webp) ### Tree Cabling & Bracing Structural support using dynamic cabling and static bracing to stabilize weak limbs, split crotches, and co-dominant stems, extending the life of mature trees. [Tree Cabling & Bracing →](/tree-cabling-bracing/) ![Tree Removal](/images/hero/certified-arborist-in-bucket-truck-sectioning-a-la.webp) ### Tree Removal Safe removal of dead, diseased, storm-damaged, or unwanted trees of any size, including full debris cleanup and hauling. [Tree Removal →](/tree-removal/) ![Tree Trimming & Pruning](/images/hero/certified-arborist-pruning-mature-shade-tree-in-le.webp) ### Tree Trimming & Pruning Structural pruning, crown thinning, crown raising, and deadwood removal to improve tree health, safety, and appearance, including storm-prep pruning. [Tree Trimming & Pruning →](/tree-trimming-pruning/)