Evaluation of Rhizoctonia solani resistance of the varieties of Kentucky bluegrass in the Beijing region

The field observation method was used to evaluate the Rhizoctonia solani resistance of 31 varieties of Kentucky bluegrass in the Beijing region in this study. The results of this study indicated that the R. solani resistance of varieties was different, and their antidisease grade ranged from highinfection to high antidisease. The relative resistance disease index of nine varieties was 0.7 to 1.00, indicating that they were high antidisease varieties; Six varieties with relative resistance disease index between 0.5 to 0.7 was the middle antidisease varieties; Nine varieties was the middleinfection of R. solani because their relative resistance disease index was 0.1 to 0.3; The relative resistance disease index of three varieties were below 0.1 and these varieties was highinfection of R. solani.