Seedling rot of Panax ginseng caused by Pythium myriotylum in Japan

  • Shihomi UzuhashiEmail author
  • Motoko Igarashi
  • Atsuyuki Hishida
  • Nobuo Kawahara
  • Tamaki Uehara-Ichiki
  • Toyozo Sato
Disease Note


Sudden wilt and blight developed on ginseng seedlings (Panax ginseng) in Ibaraki Prefecture, Japan, in June 2017. Rootlets rotted and fell off. Aseptate hyphae were observed in this trace tissue that detached from main roots, which had orange-yellowish tinges. The white mycelium isolated from the diseased main roots was identified as Pythium myriotylum based on morphology and cox1 gene sequences. The isolate reproduced the symptoms on healthy ginseng seedlings and was re-isolated from diseased seedlings. This is the first report of seedling rot (naegusare-byo in Japanese) on ginseng caused by P. myriotylum in Japan.


coxMedicinal plant Panax ginseng Seedling rot Pythium myriotylum 



The authors thank Dr. T. Shibata (NIBIOHN) and Dr. S.-B. Hong (KACC) for valuable advice on the references.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.


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Copyright information

© The Phytopathological Society of Japan and Springer Japan KK, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Genetic Resources CenterNational Agricultural and Food Research OrganizationTsukubaJapan
  2. 2.Hokkaido Division, Research Center for Medicinal Plant ResourcesNational Institutes of Biomedical Innovation, Health and NutritionNayoroJapan
  3. 3.Tsukuba Division, Research Center for Medicinal Plant ResourcesNational Institutes of Biomedical Innovation, Health and NutritionTukubaJapan

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