Journal of General Plant Pathology

, Volume 85, Issue 1, pp 79–81 | Cite as

New races of the spinach downy mildew pathogen, Peronospora farinosa f. sp. spinaciae, in Japan in 2017

  • Masaharu KubotaEmail author
  • Norihito Yamauchi
  • Yuma Yachi
  • Tomoyo Ota
  • Toshihiko Shoji
Disease Note


Six isolates of spinach downy mildew fungus, Peronospora farinosa f. sp. spinaciae, collected from Saitama and Ibaraki Prefectures in 2017 were identified. Three isolates collected from Saitama Prefecture in January differed from all the known races described by the International Seed Federation but their virulence was similar to that of strain UA1014 sampled in the USA in 2014. Isolate Iba17-2, collected from Ibaraki Prefecture in April, was identified as race 10; isolates Iba17-1 and Iba17-3, collected from the same region in February and May, did not match any known races and were coded as novel races, J17-1 and J17-2, respectively.


Spinach downy mildew Peronospora farinosa f. sp. spinaciae Race Japan 



We thank the USDA Agricultural Research Service and Dr. Diederik Smilde in Naktuinbouw for providing seeds of spinach cultivars for race identification.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Human and animal rights

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 2018

Authors and Affiliations

  • Masaharu Kubota
    • 1
    Email author
  • Norihito Yamauchi
    • 2
  • Yuma Yachi
    • 3
  • Tomoyo Ota
    • 4
  • Toshihiko Shoji
    • 5
  1. 1.National Agriculture and Food Research OrganizationInstitute of Vegetable and Floriculture ScienceIbarakiJapan
  2. 2.National Agriculture and Food Research OrganizationCentral Region Agricultural Research CenterIbarakiJapan
  3. 3.Saitama Prefectural Kawagoe Agriculture and Forestry Promotion CenterSaitamaJapan
  4. 4.Saitama Prefectural Agriculture Technology Research CenterSaitamaJapan
  5. 5.Saitama Prefectural Plant Disease and Insect Control StationSaitamaJapan

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