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Advanced tree decay testing, also referred to as Level 3 Decay Assessment, goes beyond visual inspection to evaluate the internal structural integrity of a tree. Using specialised diagnostic tools such as the Picus 3 Sonic Tomograph and the IML PD400 Resistograph, our arborists can detect internal decay, cavities, and wood strength loss without invasive damage.
This testing is essential for high-value, mature, or potentially hazardous trees located near buildings, schools, public spaces, or infrastructure. By providing defensible, science-backed data, advanced decay testing supports informed decisions about risk, retention, and long-term management.
At ArbCert, we utilise Picus 3 Sonic Tomography, a non-invasive diagnostic tool that produces cross-sectional images of a tree’s internal condition. This technology identifies hidden decay, cavities, and structural weaknesses not visible during standard inspections.
Our AQF Level 5 or Level 8 consulting arborists are trained in sonic tomography interpretation, enabling us to assess risk accurately, support compliance and guide management strategies for sensitive or high-occupancy sites.
Enquire now to book a Picus Sonic Tomography assessment and receive a comprehensive, professional report with actionable recommendations.
Advanced decay testing allows you to move beyond assumptions and make informed decisions about tree management. Instead of removing a tree simply because decay is suspected, testing provides a clear picture of its internal condition and structural capacity. This evidence-based approach helps ensure that valuable trees are not unnecessarily removed and can continue to provide environmental, aesthetic, and community benefits.
The IML PD400 Resistograph provides high-resolution measurements of wood resistance by inserting a fine drill needle into the tree, detecting changes in density along the path. This allows arborists to identify decay columns, quantify residual wall thickness, and confirm structural integrity with precision.
Resistograph testing is especially valuable when used alongside sonic tomography, ensuring both broad imaging and detailed confirmation of internal wood strength.
Contact ArbCert today to arrange a resistograph assessment and receive a detailed technical report with expert recommendations tailored to your site.
Offered by ArbCert Arboricultural Consultancy
At ArbCert, we provide advanced tree decay testing using a combined approach with Picus Sonic Tomography and IML Resistograph technology. Tomography produces a detailed cross-sectional image of the internal wood condition, while the resistograph confirms and measures the depth and extent of any decay. Together, these tools provide the most accurate and defensible assessment of structural integrity.
This dual-method approach is recommended for:
All assessments are carried out by AQF Level 5 consulting arborists and include a comprehensive written report with expert interpretation and actionable recommendations. This science-backed approach ensures confident decision-making, supports compliance, and helps retain valuable trees wherever possible.
Trust ArbCert to deliver accurate, evidence-based decay testing that goes beyond surface inspection. Contact us today to book a dual-method tree assessment.
Protect your high-value trees and reduce liability with accurate, non-invasive testing. ArbCert’s AQF Level 5 consulting arborists use industry-leading tools like the Picus 3 Sonic Tomograph and IML PD400 Resistograph to assess internal decay and structural integrity.Contact us today to schedule your Advanced Decay Testing and receive a detailed, professional report with expert recommendations tailored to your site.
Contact Us
Our team includes AQF Level 5 and AQF Level 8 consulting arborists with extensive industry experience. We bring a high level of technical knowledge to every assessment, ensuring our advice is credible, defensible, and aligned with best practice.
We deliver clear, accurate reports that meet council planning requirements and Australian Standards. From early-stage assessments to detailed impact reports, our work supports confident, informed decision-making.
As a small team, we value strong working relationships and direct communication. You’ll work with experienced arborists who understand your project and are committed to providing reliable, practical guidance every step of the way.
