We use the latest technology to assess a tree's internal condition - the Picus Tomograph and the Resistograph.
Internal Decay Detection
The first stage of a tree inspection is to carry out a visual assessment from ground level and, if necessary, by climbing the tree to examine the crown. If the tree is exhibiting visual signs of internal dysfunction or decay, further investigations are necessary. We use the latest diagnostic equipment to assess the tree’s internal condition for fractures, cavities or decay so that we can recommend the most appropriate action. Accurate interpretation of the results produced by the Picus and Resistograph can only be carried out by an experienced practitioner.
Picus Sonic Tomograph
This sophisticated equipment maps the internal condition of a tree’s stem by measuring the speed that sound travels in a number of different positions and directions. Sound travels fastest through sound wood and more slowly through decayed or degraded wood and the Picus Tomograph interprets this data to produce a visual image of the tree’s internal condition.
More detailed information can be found here
Resistograph
This instrument uses a very fine micro-drill to penetrate the tree’s tissue, measuring resistance to the probe. Sound wood provides greater resistance than decayed wood, so we can interpret the graph trace produced by the Resistograph to establish the tree’s internal condition. The Resistograph is particularly useful for testing buttress roots or for aerial examination of limbs within a tree’s crown. It is also sufficiently sensitive that it can measure individual annual growth rings.
More detailed information can be found here
Visual Tree Assessment (Mattheck and Breloer 1994).
Claus Mattheck introduced a biomechanically based system of Visual Tree Assessment (VTA), the basis of which is the identification of symptoms produced by the tree in reaction to a weak spot, or area of mechanical stress. VTA uses the reactive nature of tree growth to identify mechanical or biological changes, or weaknesses in its structure and physiological condition.
A tree is a self-optimising mechanical structure, a generating system which reacts to mechanical and physiological stresses by growing more vigorously to re-inforce weak areas, while depriving less stressed parts. This is described by Claus Mattheck as the axiom of uniform stress. An understanding of the axiom of uniform stress allows an arborist to make informed judgements about the condition of a tree.
BHA Trees Ltd Co Reg: 06765546 Reg Office:Brackenthwaite, Ulpha, Broughton in Furness, Cumbria, LA20 6EX
Tel : 01229 716498 Fax : 01229 716794 Mobile : 07801 455333
E-mail: info@bhatrees.co.uk