Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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Volume 74, Issue 1
Displaying 1-10 of 10 articles from this issue
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Originals
  • Accumulation of antifungal substances in branches of kiwifruit trees inoculated with Diaporthe sp..
    M. KINUGAWA, H. KATO, K. AKIMITSU
    2008 Volume 74 Issue 1 Pages 1-6
    Published: 2008
    Released on J-STAGE: March 05, 2008
    DOIhttps://doi.org/10.3186/jjphytopath.74.1
    JOURNAL FREE ACCESS
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    Six antifungal substances were extract from kiwifruit branches inoculated with Diaporthe sp., one was extracted from uninoculated branches, and one from wounded branches. Extracts from kiwifruit leaves also contained antifungal substances-five from leaves naturally infected with Botrytis cinerea and one from uninfected leaves. Antifungal activity of these substances was the highest 30 days after inoculation with Diaporthe sp.. Development of disease symptom also ended 30 days after the inoculation. Accumulation of antifungal substances was higher in one-year-old branches than in three- or six-year-old branches. These observations agreed with the development of disease symptoms in orchards, in which older branches of kiwifruit trees are more sensitive to Diaporthe sp. or Botrytis cinerea infection than younger ones.
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  • Occurrence of Fusarium wilt in Japan caused by Fusarium oxysporum f. sp. tanaceti.
    Y. HIROOKA, Y. MATSUMOTO, Y. EBIHARA, S. UEMATSU, T. KOBAYASHI, K.T. N ...
    2008 Volume 74 Issue 1 Pages 7-12
    Published: 2008
    Released on J-STAGE: March 05, 2008
    DOIhttps://doi.org/10.3186/jjphytopath.74.7
    JOURNAL FREE ACCESS
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    Sudden wilt of cultivated feverfew [Tanacetum parthenium (L.) Schultz-Bip.], observed in Chiba Prefecture in June 2001, was characterized by discoloration of the vascular bundles. A fungus having Fusarium-type conidia was isolated at a high rate from the discolored vascular bundles. The isolated Fusarium fungus from feverfew was pathogenic on potted feverfew and was reisolated from lesions on the inoculated plants. Based on morphological and molecular analyses, the fungus was identified as Fusarium oxysporum Schl. From the pathogenicity tests using six Asteraceae plants, a new forma specialis, Fusarium oxysporum Schl. f. sp. tanaceti Hirooka, Matsumoto et Tak. Kobay., is proposed here. This report is the first of feverfew disease caused by F. oxysporum f. sp. tanaceti. Therefore, a new disease name, Fusarium wilt (ichô-byô in Japanese) of feverfew is proposed.
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Short Communications
Disease Note
  • Seedling damping-off of carrot caused by Rhizoctonia solani AG-4 HG II.
    K. YONEMOTO, K. HIROTA, M. HYAKUMACHI
    2008 Volume 74 Issue 1 Pages 20-23
    Published: 2008
    Released on J-STAGE: March 05, 2008
    DOIhttps://doi.org/10.3186/jjphytopath.74.20
    JOURNAL FREE ACCESS
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    A new disease of carrot (Daucus carota L.) caused by Rhizoctonia solani was found in Tokushima Prefecture in 2003 and 2004. Isolates of R. solani were obtained from carrot seedlings with damping-off. Typical damping-off symptoms observed in fields were reproduced on seedlings grown from carrot seeds sown in soil amended with these isolates. The causal agent was identified as R. solani AG-4 HG II by hyphal anastomosis grouping and cultural morphology. We proposed the name of the disease as “seedling damping-off of carrot.”
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