Photo 3. Collar rot of tomato caused by Rhizoctonia, showing the cottony growth of the fungus on the stem.
Leaf blight, seedling blight, stem canker, sheath blight, web blight. Usually, the common name is followed by the host, e.g., web blight (of beans), sheath blight (of rice).
Thanatephorus cucumeris and Ceratobasidium cornigerum are the name of the sexual states, whereas the asexual states are placed in the genera Rhizoctonia and Ceratorhiza, respectively. In this fact sheet, the pathogen is called Rhizoctonia.
AUTHOR Grahame Jackson
Information from CABI (2014) Crop Protection Compendium: Thanatephorus cucumeris (https://www.cabi.org/cpc). Photos 1,2&3 Gerlach WWP (1988) Plant Diseases of Western Samoa. Samoan German Crop Protection Project, Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) Gmbh, Germany. Photo 4 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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