First report of Sclerotinia rot in sword bean caused by Sclerotinia sclerotiorum in South Korea.
The sword bean (Canavalia gladiata) is an edible tropical plant recently shown to effectively treat chronic bronchitis and rhinitis, and the area under cultivation has increased in Korea Republic. In November 2018, severe sword bean cv. Ilban sclerotia rot was observed in the research field of Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Korea Republic. The disease incidence was 15%. The rot affected both stems and pods. Many irregular black sclerotia formed necrotic lesions near the soil line of stems and on pods in contact with soil. The causal pathogen was isolated and identified as Sclerotinia sclerotiorum based on molecular data (sequence analysis of the β-tubulin gene and internal transcribed spacer (ITS) region) and pathogenicity tests. This is thought to be the first report of S. sclerotiorum causing Sclerotinia rot in sword bean in Korea Republic.