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Effects of white rot and brown rot decay on the drilling resistance measurements in wood

Evgenii Sharapov, Christian Brischke, Holger Militz and Elena Smirnova
From the journal Holzforschung


An IML-RESI PD 400 drilling tool and a standard spade drill bit (IML System GmbH, Wiesloch, Germany) were used to study the impact of white and brown rot decay on drilling resistance (DR) measurements in wood. In total, 720 drillings were made in specimens of Scots pine (Pinus sylvestris L.) heartwood and sapwood, European beech (Fagus sylvatica L.) and English oak (Quercus robur L.), which were decayed by Coniophora puteana and Trametes versicolor. Drillings were made with specimens conditioned in normal climate (20°C/65% RH) and with specimens vacuum-impregnated in water. DR and feeding force (FF) were negatively correlated with mass loss (ML) due to fungal decay. The intensity of reduction was higher for DR than for FF with increasing ML for all decay types and moisture contents (MCs). A significant difference (at 95% confidence level) in DR was found between decay types using water-saturated (WS) Scots pine specimens (3–35% ML). In most cases, DR revealed a higher predictive power of the models for ML prediction than FF. Free water in decayed specimens significantly reduced the DR and FF. Hence, the effect of ML on DR and FF of decayed and WS wood was less prominent.


The authors would like to thank Dr. Tobias Biechele (IML System GmbH, Wiesloch, Germany) for providing the PD 400 drilling tool. Dr. Susanne Bollmus and Dr. Antje Gellerich (Department of Wood Biology and Wood Products, University of Goettingen) are gratefully acknowledged for providing the test specimens.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This research work was supported by the joint program of the German Academic Exchange Service, DAAD (ID 91547167) and the Ministry of Education and Science of the Russian Federation (No. 5.8394.2017/8.9), Funder Id: 10.13039/501100003443.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.


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Received: 2017-12-08
Accepted: 2018-05-12
Published Online: 2018-06-15
Published in Print: 2018-10-25

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