Occurrence of Rhizoctonia Blight of Komatsuna Caused by Rhizoctonia solani AG-4 HG-I

Abstract

Rhizoctonia blight of komatsuna (Brassica rapa var. perviridis) occurred in Ibaraki Prefecture on July, 2009.The causal agent was identified as Rhizoctonia solani AG-4 HG-I, and pathogenicity of this pathogen was moreprominent at relatively high temperature condition. We propose that R. solani AG-4 HG-I should be added tothe pathogens of Rhizoctonia blight of komatsuna.