Abstract
From 69 isolates of Rhizoctonia solani recovered from diseased plants of canola in the west central region of Alberta, two anastomosis groups, AG-2 (50 isolates) and AG-4 (10 isolates), were found on the basis of pairing with known anastomosis group tester cultures. Isolates in AG-2 were more pathogenic to Brassica napus than those in AG-4.