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Influence of boron in CCB formulation on growth and decay capabilities of copper tolerant fungi

Einfluss des Bors in CCB-Schutzmitteln auf Wachstum und Abbaukapazität von Kupfer-tolerierenden Pilzen

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Abstract

The influence of boron in CCB preservative on infestation of leached and non-leached CCB treated wood specimens by copper tolerant and copper sensitive brown rot decay fungi are described. The tests were performed according the EN 113 procedure using seven different brown rot fungal strains: (Antrodia vaillantii (four different strains), Poria monticola, Gloeophyllum trabeum and Leucogyrophana pinastri). Leaching of boron from the CCB-treated wood samples rendered them susceptible to decay by the copper tolerant strains but not the copper sensitive ones. Additionally, using EPR spectroscopy, non-toxic copper oxalate was found in samples exposed to the copper tolerant strains (A. vaillantii and L. pinastri), as well as the copper sensitive strain P. monticola but not in the samples exposed to the other copper sensitive strain G. trabeum. It is supposed that, in the case of samples that were not leached before exposure to the copper tolerant fungi fungal growth and decay were inhibited by boron.

Zusammenfassung

Der Einfluss des Bors in CCB-Schutzmitteln auf den Befall von ausgelaugten und nicht-ausgelaugten, mit CCB behandelten Holzproben durch Kupfer-tolerierende und Kupfer-sensitive Braunfäulepilze wird beschrieben. Die Prüfung erfolgte nach EN 113 mit sieben unterschiedlichen Pilzstämmen: (Antrodia vaillantii (vier unterschiedliche Stämme), Poria monticola, Gloeophyllum trabeum und Leucogyrophana pinastri). Auslaugen des Bors aus den mit CCB behandelten Proben machte diese anfällig für den Abbau durch Kupfer-tolerante Stämme, nicht jedoch durch Kupfer-sensitive. Mit Hilfe der EPR-Spektroskopie wurde außerdem nicht-toxisches Kupferoxalat in den Proben gefunden, die Kupfer-toleranten Pilzen ausgesetzt waren (A. vaillantii und L. pinastri) und auch einem Kupfer-sensitiven (P. monticola), nicht jedoch dem anderen Kupfer-sensitiven G. trabeum. Es ist daher anzunehmen, dass die Pilzhemmung bei Proben, die ohne Auslaugung des Bors den Kupfer-toleranten Stämmen ausgesetzt werden, durch Bor bewirkt wird.

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Acknowledgements

The authors would like to thank Biffaward, Protimsolignum-Osmose, Arch Timber Protection and CSI Timber Protection for financial support.

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Authors and Affiliations

  1. Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Rožna dolina, Cesta VIII/34, 1000, Ljubljana, Slovenia

    M. Humar & F. Pohleven

  2. FPRC, Buckinghamshire Chilterns, University College, UK

    S. A. Amartey

Authors
  1. M. Humar
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  2. F. Pohleven
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  3. S. A. Amartey
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Correspondence to M. Humar.

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Humar, M., Pohleven, F. & Amartey, S.A. Influence of boron in CCB formulation on growth and decay capabilities of copper tolerant fungi. Holz Roh Werkst 62, 177–180 (2004). https://doi.org/10.1007/s00107-004-0488-8

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  • DOI: https://doi.org/10.1007/s00107-004-0488-8

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