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.
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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.
The fungus causing it (Rhizoctonia) attacks the roots and base of the stem, forming dark cankers.