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First report of phytophthora rot on Wasabia japonica caused by Phytophthora drechsleri in Japan

Abstract

In September 2014, Phytophthora rot on wasabi plants [Wasabia japonica (Miq.) Matsum.] was found for the first time in the city of Okutama, Tokyo, Japan. A Phytophthora sp. strain was constantly isolated from brown stem bases and rhizomes of infected plants. The same symptoms as those observed in the field were produced in vitro through inoculation of test plants with the isolated Phytophthora sp. The fungus was identified as Phytophthora drechsleri based on morphological and DNA sequence comparison. Phytophthora rot, “eki-byo” in Japanese, is proposed for this disease common name.

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Acknowledgements

We thank Drs. Gloria Z. Abad (USDA-APHIS-PPQ Center of Plant Health Science and Technology, USA) and André C. Lévesque (Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, Canada) for valuable comments on this manuscript, and Hideo Hoshi (Agro-Environment Division, Tokyo Metropolitan Agriculture and Forestry Research Center, Japan) for sampling. This work was supported in part by a grant from Yamazaki Spice Promotion Foundation.

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Correspondence to Yuuri Hirooka.

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Minoshima, A., Takeuchi, J., Ono, T. et al. First report of phytophthora rot on Wasabia japonica caused by Phytophthora drechsleri in Japan. J Gen Plant Pathol 83, 113–116 (2017). https://doi.org/10.1007/s10327-017-0703-1

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  • DOI: https://doi.org/10.1007/s10327-017-0703-1

Keywords

  • New disease
  • Phytophthora drechsleri
  • Phytophthora Rot
  • Wasabi
  • Wasabia japonica