Rhizoctonia

Rhizoctonia is a genus of fungi in the familyCeratobasidiaceae. Species form thin, effused, corticioidbasidiocarps (fruit bodies), but are most frequently found in their sterile, anamorph state. Rhizoctonia species are saprotrophic, but some are also facultativeplant pathogens, causing commercially important crop diseases. Some are also endomycorrhizal associates of orchids. The genus name was formerly used to accommodate many superficially similar, but unrelated fungi. As of 2025, the synonymisation of several genera under a unified Rhizoctonia was formalised, and the genus now includes names formerly circumscribed under , Ceratobasidium, Thanatephorus, Uthatobasidium, , , , , Ceratorhiza, and . As currently circumscribed, the genus contains 52 accepted species.