Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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  • Y. SATO, K. HIRAYAMA, T. TODA, C. NARA, H. FURUYA
    2021 Volume 87 Issue 3 Pages 133-145
    Published: August 25, 2021
    Released: September 16, 2021
    JOURNAL RESTRICTED ACCESS

    The incidence of small (mostly <5 mm in diameter), dark-colored lesions (DCSs: dark-colored spots) on apple fruits (e.g., cvs. Fuji, Gunma Meigetsu, Toki, Akita 19), mostly appearing from 3 weeks before harvest to 7 weeks after harvest has increased in Akita Prefecture and Aomori Prefecture in Japan since 2011. A fungus was frequently isolated from these lesions. When nonwounded apples on trees were inoculated with the fungus, spots very similar to DCSs developed, and the fungus was reisolated from the spots. The fungus was identified as Phlyctema vagabunda Desm. [synonyms Neofabraea alba (E.J. Guthrie) Verkley, N. vagabunda (Desm.), G. album Osterw.] based on its morphological and molecular characteristics. These results clearly indicate that P. vagabunda can cause DCSs and suggest that P. vagabunda is responsible for the increased incidence of DCSs on apple fruits. Overseas, the fungus is known to cause bull’s-eye rot of apples and pears. To the best of our knowledge, there are no reports describing the DCS symptom on Fuji apples caused by P. vagabunda. The most frequently observed symptoms of bull’s-eye rot of apples are very similar to those of Kigusare-byo reported in Japan. P. vagabunda was also isolated from the lesions of Kigusare-byo during storage in this study and caused typical symptoms of Kigusare-byo on apple fruits. Therefore, Kigusare-byo is, at least partially, caused by P. vagabunda, and the DCSs can be considered as a symptom of Kigusare-byo, i.e., bull’s-eye rot in apples. Based on these results and observations, we recommend “bull’s-eye rot” as the English name for Kigusare-byo. Although Kigusare-byo or bull’s-eye rot has been considered primarily a storage disease characterized by large rot lesions, we found that it may occur on fruits before harvest.

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Disease Note
  • J. MORIWAKI, S. WATANABE
    2021 Volume 87 Issue 3 Pages 146-149
    Published: August 25, 2021
    Released: September 16, 2021
    JOURNAL RESTRICTED ACCESS

    In September 2018 in Hokkaido, Japan, large, oval-shaped lesions developed on asparagus (Asparagus officinalis L.) stems, similar to stem blight caused by Phomopsis asparagi. The associated fungus was identified as Colletotrichum spaethianum based on morphological and cultural characteristics and molecular analyses of ACT, CHS1, GAPDH, H3, ITS and TUB2 nucleotide sequences. Symptoms were reproduced after inoculation of asparagus stems with the isolates, which were reisolated from the inoculated, symptomatic stems. This is the first report of Colletotrichum spaethianum causing anthracnose of asparagus in Japan.

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Abstracts of the Papers Presented at the 2021 Annual Meeting Online
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