草地早熟禾品种在北京地区对褐斑病的抗性评价

采用田间目测法对草地早熟禾（Poa pratensis）31个品种的抗病性进行评价。结果表明，不同品种（系）对褐斑病（Rhizoctonia solani）的抗性有较明显差异，抗病程度分别从高感到高抗，其中有9个品种的相对抗病指数与隶属函数值均在0.70～1.00，属褐斑病高抗；有6个的相对抗病指数与隶属函数值在0.50～0.70，属于褐斑病中抗；有1个的相对抗病指数与隶属函数值在0.30～0.50，属褐斑病感病；有9个的相对抗病指数与隶属函数值在0.10～0.30，属褐斑病中感；有3个的相对抗病指数与隶属函数值在0.10以下，属褐斑病高感；有3个品种由于评价结果不一致尚不确定其抗病等级。

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.