Sclerotinia rot was observed on cultivated as a succeeding crop in a garlic
field in Seosan-si, Korea during the growing season in 2016 and 2017. Symptoms progressed
from the initial irregular, water-soaked spots on main stems to wilting and eventually to plant
death. White, cottony mycelia and black, irregular sclerotia formed on the basal stem and on soil
surfaces. The optimal temperature of hyphal growth and sclerotia germination were 20°C and
25°C, respectively. Sequence analysis of the internal transcribed spacer (ITS) regions revealed
that the three strains isolated from are grouped with .
Three strains were identified as based on morphological features, ITS
sequence, and pathogenicity test. To the best of our knowledge, this work is the first report of
causing sclerotinia rot on in Korea.