Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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Volume 76, Issue 2
Displaying 1-3 of 3 articles from this issue
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Original
  • Suppression of violet root rot, caused by Helicobasidium mompa, with a fertilizer paste applied to soil surface around the base of apple trunks.
    M. ASARI
    2010 Volume 76 Issue 2 Pages 85-91
    Published: 2010
    Released on J-STAGE: June 25, 2010
    DOIhttps://doi.org/10.3186/jjphytopath.76.85
    JOURNAL FREE ACCESS
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    A 10-fold-diluted suspension of a fertilizer paste (product name: TP, Taki Chemical, Hyogo) was tested for suppression of violet root rot of apple, caused by Helicobasidium mompa in infested kuroboku soil (soil texture: L). In pot experiments with infested soil, disease severity on apple seedlings or rootstocks (Malus prunifolia var. ringo) treated with TP was lower than on those treated with tap water. While TP did not eradicate the pathogen colonizing bark tissues of apple, mycelial growth in the soil treated with TP was suppressed for 60 d. Mycelial growth was also suppressed 10 cm below the soil surface after 41 d of irrigation with 10 mm water at 5- or 10-d intervals. In a field trial in heavily infested soil, disease severity of apple trees with TP was equivalent to that treated with the fungicide fluazinam and slightly lower than that of the control. With TP in the field, mycelia were infrequently observed even on the root surface of damaged trees. These results suggest that the soil with the fertilizer paste applied on the soil surface can suppress disease development, by suppressing mycelial growth.
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Short Communication
  • Anthracnose crown rot of strawberry caused by Colletotrichum acutatum Simmonds ex Simmonds.
    T. MISAWA, M. KAYAMORI, H. HORITA
    2010 Volume 76 Issue 2 Pages 92-96
    Published: 2010
    Released on J-STAGE: June 25, 2010
    DOIhttps://doi.org/10.3186/jjphytopath.76.92
    JOURNAL FREE ACCESS
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    In 2006, crown rot of strawberry (Fragaria×ananassa Duchesne cv. Kentaro) was observed in production field in Hokkaido, Japan. The causal agent was identified as Colletotrichum acutatum Simmonds ex Simmonds, based on morphological characteristics, sensitivity to the fungicides benomyl and diethofencarb, and results of a polymerase chain reaction (PCR) using a specific primer. Inoculation tests with C. acutatum revealed that the fungus caused the same symptoms on strawberry plants and was reisolated from the symptoms. This is the first report of anthracnose crown rot on strawberry caused by C. acutatum in Japan.
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Disease Note
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