Occurrence of seedling damping-off of Jew's mallow, Corchorus olitorius caused by Rhizoctonia solani AG-2-1

Abstract

　Seedling damping-off of Jew's mallow (Corchorus oltorius) occurred in Kanagawa Prefecture, Japan in May, 1994. Twelve isolates of fungi were obtained from the deseased tissues. In inoculation tests at 15 and 25°C, only one isolate was pathogenic on Jew's mallow and radish seedlings at 15°C, but not at 25°C. The isolate from diseased plants was identified as Rhizoctonia solani, based on the morphological and cultural characteristics. The isolate anastomosed with standard isolate of AG-2-1 only and restriction fragment length polymorphisms (RFLP) patterns of internal transcribed spacers (ITS) region of rDNA were the same as those of the standard isolate of AG-2-1.