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First report of leaf spot (Corynespora cassiicola) in Assam indigo in Japan

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Abstract

Leaf spot caused by Corynespora cassiicola was observed on plants of Assam indigo (Strobilanthes flaccidifolius) in Higashi village in Okinawa Prefecture, Japan, in October 2019. The fungus isolated from diseased leaves was identified based on morphological characteristics and molecular analysis of the rDNA-ITS region. Inoculation tests using the isolated fungus confirmed Corynespora cassiicola as the causative agent of the disease. To the best of our knowledge, this is the first report of leaf spot disease in Assam indigo caused by C. cassiicola in Japan. Leaf spot, “hanten-byo” in Japanese, is the proposed name of the disease.

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Acknowledgements

We warmly acknowledge the collaborating farmer in Higashi village, Okinawa, Japan, for providing seedlings for pathogenicity tests.

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Authors and Affiliations

  1. Department of Civil Engineering and Construction, Nanbu Regional Public Works Office, 116-37, Asahi-machi, Naha, Okinawa, 900-0029, Japan

    Haruka Yamagishi

  2. University of the Ryukyus, 1, Senbaru, Nishihara-cho, Okinawa, 903-0213, Japan

    Haruka Yamagishi, Satoshi Taba, Yuya Gushiken, Ryuichi Suwa, Miyu Nikawadori, Misaki Suzuki, Sara Fujimori & Ken-Taro Sekine

  3. Tauns Laboratories, Inc., R & D Department, 761-1, Kamishima, Izunokuni, Shizuoka, 410-2325, Japan

    Yuya Gushiken

  4. HAPTAK Co. LTD., 2-2-30, Makishi, Naha, Okinawa, 900-0013, Japan

    Miyu Nikawadori

  5. Department of Agriculture, Forestry and Fisheries, 1-2-2, Izumizaki, Naha, Okinawa, 900-8570, Japan

    Sara Fujimori

Authors
  1. Haruka Yamagishi
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  2. Satoshi Taba
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  3. Yuya Gushiken
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  4. Ryuichi Suwa
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  5. Miyu Nikawadori
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  6. Misaki Suzuki
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  7. Sara Fujimori
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  8. Ken-Taro Sekine
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Correspondence to Satoshi Taba.

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Accession No. ITS: LC541739.

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Yamagishi, H., Taba, S., Gushiken, Y. et al. First report of leaf spot (Corynespora cassiicola) in Assam indigo in Japan. J Gen Plant Pathol 87, 192–195 (2021). https://doi.org/10.1007/s10327-021-00988-w

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  • DOI: https://doi.org/10.1007/s10327-021-00988-w

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