Characterization of Rhizoctonia species isolated from ornamentals in Florida

Rhizoctonia species were collected from Florida ornamental plants and characterized by nuclear condition and anastomosis grouping. Of 309 isolates, 126 (41%) were collected from roots, 77 (25%) from stems, and 106 (34%) from leaves. Of 129 multinucleate isolates, 43 (33%) were R. solani and 4 (3%) were R. zeae collected from roots, 30 (24%) were R. solani from stems, and 52 (40%) were R. solani from leaves. Of the isolates of R. solani, approximately 60% were from anastomosis group 4 (AG-4), 20% were AG-1 (all from leaves), and 20% could not be typed to the first four anastomosis groups (.)