Rhizoctoniaspp. Associated with Brown Patch of Saint Augustinegrass

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Abstract
Isolates of Rhizoctonia from St. Augustinegrass (S. secundatum) displaying brown patch symptoms were either R. solani anastomosis group 2 type 2 (AG2-2) or unidentified Rhizoctonia species with binucleate hyphal cells. In the laboratory, R. solani AG2-2 isolates produced brown patch symptoms on stolon sections of ''Texas Common'' St. Augustingegrass at 24.degree. C. An R. solani AG2-2 from St. Augustinegrass also caused postemergenece dampling-off in 2 cultivars of Festuca arundinacea and pre- and postemergence damping-off in 5 cultivars of Lolium perenne. No seedling disease was produced in 2 cultivars of Poa pratensis, 1 cultivar of P. trivialis, or 1 cultivar of Agrostris palustris. Isolates of the binucleate Rhizoctonia species were not pathogenic on ''Texas Common'' St. Augustinegrass or on any cool-season turfgrass tested. Symptom severity and rate of disease development varied among 4 cultivars and 11 accessions of St. Augustinegrass inoculated with R. solani AG2-2.