- any of various soil-inhabiting fungi of the genus Rhizoctonia, some species of which are destructive to cultivated plants, causing damping off of seedlings, foliage blight, root and stem cankers, and rot of storage organs.
Origin of rhizoctonia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rhizoctonia
The fungus causing it (Rhizoctonia) attacks the roots and base of the stem, forming dark cankers.Tomato Culture: A Practical Treatise on the Tomato
William Warner Tracy
This Rhizoctonia is a mere spawn or mycelium, a mass of rusty-brown material like a thick coating of spider's web of a red tint.