MOKUZAI HOZON (Wood Protection)
Online ISSN : 1884-0116
Print ISSN : 0287-9255
ISSN-L : 0287-9255
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Volume 45, Issue 1
Displaying 1-6 of 6 articles from this issue
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Commentation
Original Article
  • Influence of the number of times for inoculum preparation, the length of preculture period and the material of culture bottles on wood-decay ability of test fungi for the laboratory decay test
    Kohei KAMBARA, Hiroshi MATSUNAGA, Wakako OHMURA
    2019 Volume 45 Issue 1 Pages 14-23
    Published: 2019
    Released on J-STAGE: April 01, 2019
    DOIhttps://doi.org/10.5990/jwpa.45.14
    JOURNAL FREE ACCESS
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    The laboratory decay test specified by the Japanese Industrial Standard JIS K 1571:2010 defines the performance requirements for wood preservatives and the validity criterion of the test based on the mean mass loss of untreated specimens (Sugi sapwood) for each test fungus. In this study, we examined the influence of the following three culture conditions on the wood-decay ability of the test fungi for the purpose of selecting culture conditions that stably achieve the validity criterion: (1) the number of times for inoculum preparation, (2) the length of preculture period in culture bottles and (3) the material of culture bottles. We also investigated the wood-decay ability of the test fungi subcultured in different organizations. The results showed that the mean mass loss of Fomitopsis palustris almost exceeded the validity criterion of 30% among the three culture conditions. However, the wood-decay ability of F. palustris was appeared to be different between the organizations. On the other hand, Trametes versicolor apparently showed different mean mass loss with different length of preculture period. It is suggested that the mean mass loss of T. versicolor meets the requirement for validity criterion of 15%, once we set the longest preculture period of 15 days allowed by the JIS.
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  • Fungal contamination on the surface of wood plastic composites under outdoor exposure
    Kenichi EBE, Yoshiyuki TAKAHASHI, Rumi KONUMA, Noboru SEKINO
    2019 Volume 45 Issue 1 Pages 24-34
    Published: 2019
    Released on J-STAGE: April 01, 2019
    DOIhttps://doi.org/10.5990/jwpa.45.24
    JOURNAL FREE ACCESS
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    Outdoor exposure tests on wood plastic composites (WPCs) were conducted at seven sites in Japan. Fungal contamination was recognized on the surface of WPCs. Morphological and molecular biological analyses revealed that the contamination was derived from two species of surface contaminating fungi (Aureobasidium pullulans and Phaeococcomyces sp.). The degree of the contamination, that is, the total dark area caused by surface contaminating fungi, was quantified by using an image processing technique developed inhouse. The results showed a possibility that the propagation of the surface contaminating fungi was influenced by the temperature and precipitation at exposure sites, as well as the installation environment of WPCs. Furthermore, it was also found that the propagation of the surface contaminating fungi was saturated or decreased after 1-year exposure. The analysis of the number of dark area cluster and the average dark area revealed that surface contaminating fungi multiplied by repeating the random occurrence and the aggregation of surface contaminating fungi.
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