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First Report of Botrytis Mold Caused by Botrytis cinerea on Peonies (Paeonia lactiflora Pall.)
Res. Plant Dis. 2020;26:279-282
Published online December 31, 2020
© 2020 The Korean Society of Plant Pathology.

Hyo Jeong Kim1, Min Young Park2, Kyung-Cheol Ma2, and Young Cheol Kim3*

1Environment-Friendly Agriculture Research Institute, Jeollanamdo Agricultural Research & Extension Services, Naju 58213, Korea
2Horticultural Research Institute, Jeollanamdo Agricultural Research & Extension Services, Naju 58213, Korea
3Department of Applied Biology, Chonnam National University, Gwangju 61186, Korea
Tel: +82-62-530-2071
Fax: +82-62-530-0208
Received September 12, 2020; Revised November 12, 2020; Accepted November 12, 2020.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In 2019, symptoms of Botrytis mold on the peony (Paeonia lactiflora Pall.) ‘Sarah Bernhardt’ were observed during a survey of the commercial greenhouses of Gangjin County, South Korea. The initial symptoms, small brown spots, were observed mainly at the leaf margins. The lesions extended to the interior of leaves forming irregular spots in which abundant conidia developed. Fungal colonies were obtained from surface-sterilized tissue excised from growing edges of the lesions that were transferred to potato dextrose agar. Melanized irregular sclerotia were formed in these colonies after 40 days at 8°C. Molecular phylogeny based on sequences of genes for glyceraldehyde-3-phosphate dehydrogenase, heat-shock protein 60, and RNA polymerase subunit II were highest for the PBC-2 isolate to the type strains of Botrytis cinerea, rather than other Botrytis species associated with peony diseases. Following Koch’s postulates, healthy Sarah Bernhardt plants were inoculated with a foliar application of conidial suspensions of the isolate PBC-2. Following incubation under humidity with a 12 hr photoperiod for 7 days, symptoms developed on the leaf margins that were identical to those observed in the greenhouses. This study is the first report of Botrytis blight caused by B. cinerea on peonies grown in commercial greenhouses in South Korea.
Keywords : Botrytis mold, Paeonia lactiflora, Peony

December 2020, 26 (4)