Seedling damping-off of carrot [Daucus carota] caused by Rhizoctonia solani AG-4 HG II

A new disease of carrot (Daucus carota L.) caused by Rhizoctonia solani was found in Tokushima prefecture in 2003 and 2004. Isolates of R. solani were obtained from carrot seedlings with damping-off. Typical damping-off symptoms observed in fields were reproduced on seedlings grown from carrot seeds sown in soil amended with these isolates. The causal agent was identified as R. solani AG-4 HG II by hyphal anastomosis grouping and cultural morphology. We proposed the name of the disease as 'seedling damping-off of carrot'.