| Rhizoctonia
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| Disease of cucumber caused by Rhizoctonia solani
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| Scientific classification
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| Kingdom:
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Fungi
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| Division:
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Basidiomycota
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| Class:
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Agaricomycetes
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| Order:
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Cantharellales
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| Family:
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Ceratobasidiaceae
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| Genus:
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Rhizoctonia
DC. (1815)
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| Type species
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Rhizoctonia solani
J.G. Kühn (1858)
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| Species
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- Rhizoctonia amygdalispora
- Rhizoctonia anceps
- Rhizoctonia angustispora
- Rhizoctonia anomala
- Rhizoctonia australiensis
- Rhizoctonia biapiculata
- Rhizoctonia bicornis
- Rhizoctonia brevispora
- Rhizoctonia bulbillifaciens
- Rhizoctonia butinii
- Rhizoctonia chavesiana
- Rhizoctonia cornigera
- Rhizoctonia erinnae
- Rhizoctonia floccosa
- Rhizoctonia fumigata
- Rhizoctonia fusispora
- Rhizoctonia gardneri
- Rhizoctonia globispora
- Rhizoctonia gomesae
- Rhizoctonia hebelomatospora
- Rhizoctonia hydrophila
- Rhizoctonia klebahnii
- Rhizoctonia korinnae
- Rhizoctonia lantanae-camarae
- Rhizoctonia microsclerotia
- Rhizoctonia myrtisiae
- Rhizoctonia niltonsouzana
- Rhizoctonia noxia
- Rhizoctonia obscura
- Rhizoctonia ochracea
- Rhizoctonia papillata
- Rhizoctonia pennata
- Rhizoctonia pernacatena
- Rhizoctonia praticola
- Rhizoctonia praxillae
- Rhizoctonia pseudocornigera
- Rhizoctonia queenslandica
- Rhizoctonia ramicola
- Rhizoctonia repetospora
- Rhizoctonia rhizodes
- Rhizoctonia robertsii
- Rhizoctonia sapphoae
- Rhizoctonia sasakii
- Rhizoctonia scaberula
- Rhizoctonia setariae
- Rhizoctonia solani
- Rhizoctonia sphaerospora
- Rhizoctonia sterigmatica
- Rhizoctonia stridii
- Rhizoctonia terrigena
- Rhizoctonia theobromae
- Rhizoctonia tradescantiae
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| Synonyms
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Moniliopsis Ruhland (1908)
Ceratobasidium D.P. Rogers (1935)
Thanatephorus Donk (1956)
Uthatobasidium Donk (1956)
Koleroga Donk (1958)
Cejpomyces Svrček & Pouzar (1970)
Oncobasidium Talbot & Keane (1971)
Ypsilonidium Donk (1972)
Aquathanatephorus Tu & Kimbrough (1978)
Ceratorhiza R.T. Moore (1987)
Tofispora G. Langer (1994)
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Rhizoctonia is a genus of fungi in the family Ceratobasidiaceae. Species form thin, effused, corticioid basidiocarps (fruit bodies), but are most frequently found in their sterile, anamorph state. Rhizoctonia species are saprotrophic, but some are also facultative plant 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 Moniliopsis, Ceratobasidium, Thanatephorus, Uthatobasidium, Koleroga, Cejpomyces, Oncobasidium, Ypsilonidium, Ceratorhiza, and Tofispora. As currently circumscribed, the genus contains 52 accepted species.