Abstract:Pathogenicity of Gaeumannomyces graminis var.tritici (Ggt),Gaeumannomyces graminis var.avenae (Gga),Gaeumannomyces graminis var.maydis (Ggm) and Gaeumannomyces graminis var.graminis (Ggg) to four species of gramineal grasses,Dactylis glomerata,Elymus dahu