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    Author(s): Zicai Xu; Theodor D. Leininger; James G. Williams; Frank H. Tainter
    Date: 2000
    Source: SJAF 24(l) 2000
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (157 KB)


    The Arborsonic Decay Detector (ADD; Fujikura Europe Limited, Wiltshire, England) was used to measure the time it took an ultrasound wave to cross 280 diameters in red oak trees with varying degrees of bacterial wetwood or heartwood decay. Linear regressions derived from the ADD readings of trees in Mississippi and South Carolina with wetwood and heartwood decay yielded significantly different lines for some combinations and locations. The results of this study suggest that the ADD cannot yet be used to detect wetwood in oak trees with enough certainty to be of practical use to a forester or land manager. However, regression lines describing ADD readings of trees with wetwood at both study sites were located between those of healthy trees and decayed trees suggesting some, albeit limited, ability to differentiate wetwood trees. The use of ultrasound to detect bacterial wetwood in red oaks may be improved by designing a system that allows measurement of signal amplitude and evaluation of waveform patterns. The ability to successfully detect trees with heartwood decay was better, especially for trees with advanced decay.

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    Xu, Zicai; Leininger, Theodor D.; Williams, James G.; Tainter, Frank H. 2000. Examination of the Arborsonic Decay Detector for Detecting Bacterial Wetwood in Red Oaks. SJAF 24(l) 2000

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