Fungi classified as Rhizoctonia species represent an amalgam of taxonomically diverse groups that differ in many significant features, including their sexual stages (teleomorph), asexual stages (anamoI]'lh), and other characters (101, 106, 107). Because of the importance of many Rhizoctonia species as plant pathogens, a variety of useful approaches have been developed for identifying many groups of Rhizoctonia spp. based on ultrastructural features, information from teleomorphs, anastomosis behavior, and molecular biology. This review summarizes recent progress in understanding patterns of genetic diversity revealed through application of molecular data, and the relation of genetic diversity to the taxonomy and population biology of Rhizoctonia. Several reviews have summarized the most current framework for under standing diversity within Rhizoctonia , including the R. solani complex (79), binucleate Rhizoctonia (48), and other Rhizoctonia (101). Most Rhizoctonia can now usually be classified into major groups based on teleomorph associ ation, as well as into more narrowly defined intraspecific groups (1, 5,79). Progress in understanding the biology and pathology of Rhizoctonia can be traced to the realization that genetically diverse groups exist at several levels of organization:
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Vilgalys et al. (1994) studied this question.
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