Rice sheath blight is the serious fungual diseases in rice.The traditional method to test the pathogenicity of Rhizoctonia solani based on the relative height of lesion on rice needs to inoculate rice at late tillering or heading stage which is time-consuming and difficult to control the conditions.In this study,compared with the traditional way,the evaluation of Rhizoctonia virulence and bioactivity of crude toxin was conducted on the way of detached rice leaf and rice leaf sheath.The results showed that,a...