Abstract
In August 2021, we surveyed diseases of wild vegetables grown in Taebaek, Gangwon Province, Korea. During the disease survey, we observed severe damping-off symptoms in young edible aster (<i>Aster scaber</i>) plants in a vinyl greenhouse investigated. The incidence of the disease in the plants ranged from 5% to 20%. Diseased plants of edible aster were collected from the vinyl greenhouse, and fungi were isolated from petiole lesions of the diseased plants. <i>Rhizoctonia</i> sp. was consistently isolated from the petiole lesions. We examined morphological characteristics and anastomosis groups of nine <i>Rhizoctonia</i> sp. isolates obtained from the petiole lesions. The examination results revealed that all the isolates corresponded to <i>Rhizoctonia solani</i> AG-4 based on the morphological characteristics and anastomosis test. Three isolates of <i>R. solani</i> AG-4 were tested for their pathogenicity on edible aster plants by artificial inoculation. Inoculation tests showed that the tested isolates caused damping-off symptoms on the inoculated plants. The induced symptoms were similar to those observed in the vinyl greenhouse investigated. Damping-off of edible aster caused by <i>R. solani</i> AG-4 is first reported in this study.
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