Is your tree safe? Is it healthy? Should it be pruned, treated or removed? These are questions only a professional tree diagnosis can answer reliably. Plumridge Tree Experts provides comprehensive tree health assessments and diagnostic services across the Brussels region and Walloon Brabant.
Why invest in a professional tree diagnosis?
Trees are long-lived organisms, and problems develop slowly — often invisibly. A tree that looks fine from the outside may be severely decayed inside. Conversely, a tree that looks alarming may be perfectly safe. Without expert assessment, you are guessing.
A professional diagnosis provides:
- Peace of mind: confirmation that your tree is safe, or clear guidance on what needs to be done.
- Legal protection: if a tree causes damage, demonstrating that you had it assessed by a qualified arborist shows due diligence.
- Informed decision-making: should you prune, cable, brace or remove? A diagnosis gives you the facts to decide.
- Early detection: catching disease, decay or structural problems early often means less invasive and less expensive treatment.
- Insurance support: some insurers may request an arborist report before covering tree-related risks.
Our diagnostic process
Visual Tree Assessment (VTA)
The foundation of every diagnosis. Our arborist systematically examines:
- Crown condition: dieback, thinning, discoloration, asymmetry, epicormic growth (water shoots).
- Trunk: cracks, cavities, bulges, bark abnormalities, fungal fruiting bodies (brackets and mushrooms).
- Root zone: soil heaving, exposed roots, root decay, signs of disturbance from construction or grade changes.
- Branch structure: co-dominant stems, included bark, dead branches, crossing branches, previous pruning wounds.
- Lean: is it natural (grown that way) or recent (indicating root failure)?
Advanced diagnostic tools
When the visual assessment identifies potential internal defects, we deploy specialist instruments:
- Resistograph (micro-drill resistance): a thin drill is inserted into the trunk, and resistance is measured continuously. Drops in resistance indicate internal decay, cavities or cracks. The tree suffers minimal damage from the 3 mm diameter hole.
- Sonic tomography: sensors placed around the trunk measure the speed of sound waves passing through the wood. Decayed or hollow areas transmit sound more slowly, producing a colour-coded cross-section map of internal condition.
- Root investigation: air-spade excavation to expose roots without damaging them, allowing visual assessment of root decay or severance.
Risk categorisation
Based on the assessment, we categorise the tree’s risk level:
- Low risk: no significant defects, routine monitoring recommended.
- Moderate risk: defects present but manageable through pruning, bracing or regular monitoring.
- High risk: significant structural defects requiring urgent intervention — major pruning, cabling or removal.
- Imminent risk: failure is likely in the near term — immediate action required.
Written report
You receive a clear, professional report including:
- Species identification, dimensions and estimated age.
- Findings from visual and instrumental assessments.
- Risk category and reasoning.
- Recommended actions with timeframes.
- Photographs and, where applicable, tomography images.
This report serves as a record for your files, your insurer or the municipality.
When should you have your tree assessed?
- You notice something unusual: fungal brackets on the trunk, sudden leaf loss, cracks, leaning.
- After a storm: even if the tree appears intact, hidden damage (root plate movement, internal splits) may have occurred.
- Before construction work: if building near a tree, an assessment ensures you understand the impact on the tree and vice versa.
- Before buying a property: large trees add value but can also represent significant liabilities. A pre-purchase tree survey identifies any issues.
- As routine maintenance: we recommend professional inspections every 3–5 years for mature trees, or every 1–2 years for known high-risk specimens.
- When neighbours raise concerns: an independent arborist report settles disputes with facts rather than opinions.
Common tree health problems in the Brussels region
- Ash dieback (Hymenoscyphus fraxineus): a devastating fungal disease now affecting the majority of ash trees in Belgium. Causes progressive crown death and brittle wood.
- Horse chestnut leaf miner (Cameraria ohridella): causes premature browning and leaf fall, weakening the tree over time.
- Massaria disease of plane trees: causes rapid death of large branches, creating a significant falling hazard.
- Honey fungus (Armillaria spp.): a root pathogen that kills trees and can spread to neighbouring specimens.
- Phytophthora root rot: increasingly common, particularly on waterlogged sites.
- Bracket fungi (Ganoderma, Inonotus, Meripilus): indicators of advanced internal decay in the trunk or roots.
Early diagnosis of these conditions can mean the difference between saving a tree and losing it.
Tree diagnosis for legal and insurance purposes
A Plumridge diagnostic report can serve as:
- Evidence of due diligence: demonstrating that you, as the tree owner, took reasonable steps to assess and manage risk.
- Supporting documentation for planning applications: municipalities may require an arborist report when development is proposed near protected trees.
- Basis for insurance claims: documenting tree condition before and after storm events.
- Expert evidence in neighbour disputes: an impartial arborist assessment provides objective information.
Why choose Plumridge for tree diagnosis
- Qualified arborists: trained in advanced tree assessment methodologies.
- Diagnostic technology: resistograph and sonic tomography available for internal assessment.
- Clear reporting: professional, jargon-free reports that you, your insurer and your municipality can understand.
- Independent advice: we recommend the most appropriate action, not the most expensive one.
- English-speaking: reports and consultations available in English, French and Dutch.
- Local knowledge: familiar with Brussels-region tree species, common problems and regulatory requirements.
Book a tree diagnosis
Concerned about a tree on your property? Contact Plumridge for a professional assessment.
📞 +32 2 372 0452 — Initial consultation is free of charge.
Frequently asked questions
How much does a tree diagnosis cost?
A standard Visual Tree Assessment for one or two trees is often included in our free initial consultation. If advanced diagnostic tools (resistograph, tomography) are needed, costs depend on the number of trees and the complexity of the assessment. We provide a clear quote before proceeding.
Can you diagnose a tree without cutting into it?
Yes. The Visual Tree Assessment is entirely non-invasive. Sonic tomography is also non-invasive. The resistograph creates a 3 mm hole that causes negligible harm. We never need to cut into a tree to assess it.
What if the diagnosis shows the tree is dangerous?
We will explain the findings, discuss the options (pruning, cabling, removal) and provide a quote for the recommended work. For imminent risks, we can act promptly to make the tree safe.