First report of black root rot of lettuce in Japan caused by Berkeleyomyces rouxiae
In August 2016, lettuce plants (Lactuca sativa) cultivated in Gunma Prefecture became stunted and often wilted. Dark brown to black lesions were observed on roots of diseased plants. Most small feeder roots were lost. Fungi isolated from lesions on roots were identified as Berkeleyomyces rouxiae based on their morphological and genetic characteristics. Pathogenicity of this fungus on lettuce was confirmed by inoculation and reisolation. This report is the first of black root rot caused by B. rouxiae on lettuce in Japan.
KeywordsChalara elegans Lactuca sativa Soilborne pathogen Thielaviopsis basicola
We thank Dr. Wilma Nel, Dr. Tuan Duong, and Prof. Wilhelm de Beer (Forestry and Agricultural Biotechnology Institute, University of Pretoria, South Africa) for providing nucleotide sequences and other fungal information. We are grateful to Prof. M. Shishido (Graduate School of Horticulture, Chiba Univ.) for checking our manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.
Human and animal rights statement
This article does not contain any studies with human participants or animals performed by any of the authors.
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