International Sugar Journal

Rhizoctonia seedling disease on sugar beet [Full subscriber]

Rhizoctonia seedling damping-off can cause losses in sugar beet as well as providing inoculum for later root rot. The disease is caused by Rhizoctonia solani. The pathogen has several subgroups, anastomosis groups (AG), of which AG-4 has historically been associated with damping-off, while AG-2-2 is the major cause of mature plant root rot. Recently little AG-4 had been isolated in Michigan, although damping-off was occurring. In this work, the subgroups of R. solani associated with seedlings in the Michigan Sugar growing area was investigated, and approximately 80% of seedling isolates were found to be AG-2-2. Germplasm was identified that varies…

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