Identification of anastomosis groups of Rhizoctonia sp. from soil and organic materials in ornamental landscapes in Shiraz

During May 2011 to September 2012 soil samples from Shiraz landscape were collected,air dried and passed through a 2-mm sieve and baited with sugarbeet seeds. Twenty seven isolates of Rhizoctonia were isolated from soil, which 20 isolates belonged to Rhizoctonia solani AG2 (6 isolates), AG4 (7 isolates), AG2.2, AG7 and AG13 (each one isolate) and 7 isolates of binucleate Rhizoctonia (BNR). Also eleven isolates ofR. solani were isolated from organic matter contained of AG2 (3 isolates), AG4 (4), and AG7 (1). Anastomosis group of some isolates of R. solani and all isolates of BNR due to unavailability of tester isolates could not be identified.