First report of stem blight on Joseph’s coat amaranth (Amaranthus tricolor L.) caused by Diaporthe amaranthophila (Inácio, Dianese & Carlos) Rossman & Udayanga in Japan

  • Ayaka Minoshima
  • Noriko Orihara
  • Kaoru Minoguchi
  • Seiju Ishikawa
  • Yuuri HirookaEmail author
Disease Note


In September 2015, stem blight was found on Joseph’s coat amaranth (Amaranthus tricolor) in Kanagawa, Japan. A fungus was isolated from brown spots on the stems and leaves. After our inoculation tests using the isolated fungus, the same symptoms were observed in the field. The pathogen was identified as Diaporthe amaranthophila based on morphological and molecular analyses. This is the first report of D. amaranthophila as a pathogen of stem blight on Joseph’s coat amaranth in Japan.


Diaporthales Phomopsis amaranthi Phylogeny New disease Pigweed C conidia 



We thank Dr. Hiromichi Horie for hosting a collecting trip that aided in the discovery of this disease. We also thank Tomoko Ohta for advising us about molecular methods.

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.

Supplementary material

10327_2019_885_MOESM1_ESM.pdf (260 kb)
Supplementary file1 (PDF 259 kb)


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Copyright information

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

Authors and Affiliations

  • Ayaka Minoshima
    • 1
  • Noriko Orihara
    • 2
  • Kaoru Minoguchi
    • 3
  • Seiju Ishikawa
    • 1
  • Yuuri Hirooka
    • 1
    Email author
  1. 1.Department of Clinical Plant Science, Faculty of BioscienceHosei UniversityKoganeiJapan
  2. 2.Kanagawa Prefectural Agriculture Technology CenterKanagawaJapan
  3. 3.Yokosuka-Miura Region Prefectural Administration CenterKanagawaJapan

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