The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Leaf Spot of Rhubarb Caused by Didymella rhei in Korea

  • Lee, Gyo-Bin (Global Agro-Consulting Corporation) ;
  • Mo, Young-Moon (Ginseng & Medicinal Plant Research Institute, Gangwondo Agricultural Research and Extension Services) ;
  • Cho, Weon-Dae (Global Agro-Consulting Corporation) ;
  • Kim, Wan-Gyu (Global Agro-Consulting Corporation)
  • Received : 2021.11.29
  • Accepted : 2021.12.20
  • Published : 2021.12.31
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Abstract

During disease surveys conducted from 2019 to 2021 in Korea, leaf spot symptoms in rhubarb (Rheum rhabarbarum) plants were frequently observed in plants growing in fields located in Cheolwon, Taebaek, and Inje in Gangwon Province. The incidence of diseased leaves of the plants in the fields ranged from 2% to 80%. Nine single-spore isolates of Phoma sp. were obtained from lesions of the diseased leaves; all of them were identified as Didymella rhei based on their cultural, morphological, and molecular characteristics. Three isolates of D. rhei were tested for pathogenicity on rhubarb leaves using artificial inoculation. All the tested isolates caused leaf spot symptoms in the inoculated plants; the symptoms were similar to those observed in plants from the fields investigated. This is the first report of D. rhei causing leaf spot in rhubarb in Korea.

Keywords

Acknowledgement

This study was supported by a research grant (PJ014507012020) from the Rural Development Administration, Korea.

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