Abstract
Crater disease (CD) of wheat (Triticum aestivum L.) on the Springbok Flats, South Africa, and bare patch disease of cereals occurring elsewhere in the world, are both caused by Rhizoctonia solani Kühn (Samuel & Garrett, 1932; Deacon & Scott, 1985), albeit by different anastomosis groups of the pathogen. Bare patch is ascribed to root infection by anastomosis group (AG) 8 (Neate & Warcup, 1985), whereas recent evidence (Carling et al., 1996) assigned the CD R. solani to AG-6. However, unlike other isolates of AG-6 (and all other AGs of R. solani for that matter), the CD AG-6 also produces bridging reactions with R. solani AG-1 IA (Carling et al., 1996). Furthermore, AG-6 has previously been found only in non-pathogenic association with orchid roots (Uetake et al., 1988) turfgrass (Zhang & Dernoeden, 1995) and as inhabitant of uncultivated soil (Kuninaga et al., 1979), whereas the CD R. solani causes a destructive disease. Considering the polymorphic and phylogenetically-diverse nature of AG-6 (Kuninaga & Yokosawa, 1984a) it seems reasonable to assume that the CD R. solani could constitute a separate subgroup within this AG.
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Meyer, L., Nel, L.H., Carling, D.E. (1997). Anastomosis Grouping and Molecular Genetic Typing of Rhizoctonia Solani Causing Crater Disease of Wheat in South Africa. In: Dehne, HW., Adam, G., Diekmann, M., Frahm, J., Mauler-Machnik, A., van Halteren, P. (eds) Diagnosis and Identification of Plant Pathogens. Developments in Plant Pathology, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0043-1_11
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DOI: https://doi.org/10.1007/978-94-009-0043-1_11
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