Journal of Turkish Phytopathology, vol.48, pp.1-6, 2019 (Peer-Reviewed Journal)
Sclerotium rolfsii Sacc. is a polifag soil-borne fungal pathogen. This research aims to find out the mycelial compatible
groups (MCG) of S. rolfsii, the differences in pathogenicity and morphological characters. All isolates collected from diseased
green beans in Çanakkale during September, 2015. Twenty seven isolates in total were paired with each other in potato dextrose
agar (PDA) to determine mycelial compatible groups (MCG). Pairings were scored as mycelial compatible if sclerotia formed in
the interaction zone, however pairings were scored as mycelial incompatible if a barrier occurred. Three MCGs were determined.
There were statistical differences in means of mycelial growth, the number and diameter of sclerotia produced. The correlation
analysis exhibited that there was a negative correlation between sclerotium number-mycelial growth and sclerotium number and
sclerotium diameter; however there have been positive correlation between mycelial growth and sclerotium diameters. All
isolates were found to be highly virulent on tested bean seedlings. This research shows that there is phenotypic variation among
isolates of S. rolfsii.