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Romeralo, Carmen, 2010. Reliability of Rotfinder instrument for detecting decay in standing trees. Second cycle, A1E. Uppsala: SLU, Dept. of Forest Mycology and Plant Pathology

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Abstract

A wood decay detecting instrument, Rotfinder® was evaluated for its accuracy, sensitivity and specificity in detecting decay in standing trees. Five hundred trees were measured in three different stands with Rotfinder at three heights in the stems. The trees were felled and sectioned, and presence or absence of decay was observed for each section. Wood samples were taken from every section and their wood density and moisture content was measured. Rotfinder accuracy of detecting both decayed and healthy trees was 82.7%. The highest sensitivity was obtained at stump height (55.9%). Advanced decay was detected in the 71% of cases while incipient decay was detected in the 23% of cases. Rotfinder has a scale from 0 to 10 which indicates an increasing degree of probability of decay. Rotfinder values higher than 4 indicated more than 90% of probability of finding decay. Rotfinder successful detections (true positives and true negatives) and Rotfinder failures (false positives and false negatives) were compared in terms of moisture content, wood density and N, C, Mg, Ca, K, Na and Mn concentration. True positives had higher moisture content in reaction zone and decay, higher density in reaction zone and higher concentration of calcium and sodium of reaction zone than false negatives. Relationship between Rotfinder values and wood characteristics were studied, and the potassium concentration showed the highest correlation with Rotfinder values.

Main title:Reliability of Rotfinder instrument for detecting decay in standing trees
Authors:Romeralo, Carmen
Supervisor:Stenlid, Jan and Oliva, Jonas
Examiner:Djurle, Annika
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2010
Level and depth descriptor:Second cycle, A1E
Student's programme affiliation:SMJMP Master of Science in Forestry - Open Entrance 300 HEC
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Keywords:rotfinder instrument, decay, non-destructive, standing trees, heterobasidion spp.
URN:NBN:urn:nbn:se:slu:epsilon-8-763
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-763
Subjects:Plant diseases
Miscellaneous plant disorders
Handling, transport, storage and protection of forest products
Forestry - General aspects
Forestry production
Forest engineering
Forest injuries and protection
Language:English
Deposited On:22 Sep 2010 09:05
Metadata Last Modified:20 Apr 2012 14:15

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