ISHS Acta Horticulturae 496: International Symposium on Urban Tree Health
FIELD EXPERIENCE WITH TREE DECAY DETECTING TOOLS |
| Author: | R. Kappel |
| Keywords: | wood, rot, Visual Tree Assessment, Resistograph, Fractometer |
| Abstract:
The detection and evaluation of decay in trees is very important to perceive hazardous trees. VTA (Visual Tree Assessment) is a visual tree inspection method with verified failure criteria. VTA is guided by the principles of biomechanics and based on the Axiom of uniform stress. After a visual inspection for diagnostic symptoms those defects, which turned out to be critical will be examined with special measuring tools. The Fractometer and the Resistograph-M are decay detecting tools which have been recently developed by Forschungszentrum Karlsruhe in co-operation with IML-Instrumenta Mechanik Labor GmbH to identify and evaluate hazardous conditions in trees. Examples for the detection of different kind of decay are presented for each of the tools. | |
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