Composition and virulence variation of the pathogen of wheat sharp eyespot from Henan Province The anastomosis groups and ITS sequence analysis of Rhizoctonia solani isolates of tobacco target spot Identification and analysis of anastomosis groups of Rhizoctonia solani from potatoes in Inner Mongolia Population structure of Rhizoctonia spp. isolated from maize in southwestern China and UP-PCR analysis Composition and pathogenic analyses of the pathogen of wheat sharp eyespot in Hebei Province