noun
also rhizoctonia
( -s )
Etymology: New Latin Rhizoctonia
1. : a disease caused by fungi of Rhizoctonia or closely related genera
2. : a disease of potatoes caused by a fungus ( Pellicularia filamentosa syn. Rhizoctonia solani ) and characterized especially by black scurfy spots on the tubers — called also little potato, rosette, russet scab, stem canker ; compare damping-off