MOKUZAI HOZON (Wood Protection)
Online ISSN : 1884-0116
Print ISSN : 0287-9255
ISSN-L : 0287-9255
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Volume 19, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 19 Issue 1 Pages 2-12
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.2
    JOURNAL FREE ACCESS
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  • Durability of Round Wood Posts for Erosion Control Projects in Toyama Prefecture, I
    Service lives of sugi and karamatsu posts used for fence works
    Masuo HASEGAWA, Hiroshi NAKATANI, Yasuo IIJIMA, Hiroshi YASUDA, Akio K ...
    1993 Volume 19 Issue 1 Pages 13-22
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.13
    JOURNAL FREE ACCESS
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    Fence work has been conducted to control the soil erosion and recover the vegetation, and numerous wood posts are installed as fence materials. To evaluate the service lives of the wood posts in the practical conditions, 44 executed sites were surveyed in Toyama Prefecture at III times. The survey was consisted of the visual inspection on-site and the mechanical testing of sampled pieces. The former was conducted by visual grading of 15 posts according to the FFPRI method shown in Table 1, and the relationship between the mean damage grade and the breakage rate was obtained. For the latter one, the compression strength parallel to the grain was tested to investigate the relationship between the damage grade and the mechanical properties. Results obtained are summarized as follows;
    1) All wood posts were conducted to the fence works without any preservative treatments before installation into the ground. More than eighty percent of the installed posts were prepared from sugi (Cryptomeria japonica) and karamatsu (Larix spp.) logs, and their average dimensions were ca. 11 cm for apical diameter, ca. 1.2m for total length and ca. 40 cm for length above ground.
    2) The compression strengths parallel to the grain of the installed posts decreased linearly with increasing of grade rating of damage, and they attained to zero when the damage rate reached at grade 5.
    3) Assuming that the rapid increase of the breakage rate at 10 percent corresponded to the critical limit of the service lives of installed posts, the values of those were estimated to be about 7.4 and 8.7 years for sugi and karamatsu respectively, from the corresponding values of the damage grade at 3.4.
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  • A NOVEL TERMITICIDE, HACHIKUSAN (imidacloprid)
    Shin-ichi TSUBOI, Tomoaki IIJIMA, Miyato HIGAKI
    1993 Volume 19 Issue 1 Pages 23-31
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.23
    JOURNAL FREE ACCESS
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    Hachikusan (Commercial Name in Japan, Common Name : imidacloprid, Chemical Code No. : NTN 33893) is a novel termiticide belonging a completely new category of insecticide.
    Imidacloprid was synthesized as NTN 33893 by Nihon Bayer Agrochem in 1985.
    The compound being a specific chemical structure and mode of action with low mammalian and fish toxicities has finished its biological tests.
    Due to stable property in soil in spite of its moderate initial killing activity and slow action against the termites, Hachikusan is especially appropriate for the ground application with 20 % flowable formulation.
    To cope with contradictory requests from the market recently that newly developed termiticides should be mild to environment, safer to applicators and should be kept its effectiveness in longer period than conventional termiticidies being on the market, Hachikusan has been paid much efforts and trials from all directions in research such as not only biological performance but also environmental science, toxicology and formulation studies etc. in its development procedure.
    It will be a great merit that recommendable application dosage of Hachikusan is 1/10 times lower than conventional termiticides.
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 19 Issue 1 Pages 32-35
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.32
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 19 Issue 1 Pages 36-38
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.36
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 19 Issue 1 Pages 39-40
    Published: January 30, 1993
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.19.39
    JOURNAL FREE ACCESS
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