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Physiology and Biochemistry

Differentiation of Populations of AG-2-2 of Rhizoctonia solani by Analysis of Cellular Fatty Acids. Janell Stevens Johnk,Graduate research assistant, Department of Plant Pathology, University of Minnesota, St. Paul 55108; Roger K. Jones, Assistant Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Phytopathology 83:278-283. Accepted for publication 1 December 1992. Copyright 1993 The American Phytopathological Society. DOI: 10.1094/Phyto-83-278.

A population of Rhizoctonia solani representing AG-2-2 IIIB (mat rush type) and AG-2-2 populations isolated from corn, sugar beet, and turfgrass were analyzed for cellular fatty acid composition. The AG-2-2 IIIB population and populations of isolates from turfgrass and from sugar beet (AG-2-2 IV) were differentiated by cluster and principal component analyses of the percent composition of the fatty acids identified. A dendrogram of the four populations shows that AG-2-2 IIIB and the population from corn were closely related, and the population from turf was distinct from AG-2-2 IIIB and AG-2-2 IV.

Additional keywords: brown patch, Juncus effusus, St. Augustine grass.