Korean Journal of Mycology (Kor. J. Mycol.)
Gyo-Bin Lee 1, Young-Moon Mo 2, Weon-Dae Cho 1, and Wan-Gyu Kim 1*
1Global Agro-Consulting Corporation, Suwon 16614, Korea
2Ginseng & Medicinal Plant Research Institute, Gangwondo Agricultural Research and Extension
Services, Cheolwon 24054, Korea
Correspondence to wgkim5121@naver.com
Korean Journal of Mycology (Kor J Mycol) December, 2021, 49(4):555-560.
https://doi.org/10.4489/KJM.20210055
Accepted: December 20, 2021; Revised: December 15, 2021; Received: November 29, 2021
Published: December, 2021.
© 2021 THE KOREAN SOCIETY OF MYCOLOGY.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.
Didymella rhei, Leaf spot, Pathogenicity, Rheum rhabarbarum, Rhubarb