Tobacco rattle virus

Aboveground symptoms of corky ringspot rarely occur. Symptoms in tubers vary depending on virus strain, potato variety, temperature, and time of infection. Symptoms include rings of dark brown corky layers in the tuber that alternate with rings of healthy tissue. Internally, small brown flecks are diffused through the tuber. This symptom can be confused with symptoms caused by alfalfa mosaic, which is often more common than corky ringspot.

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Presence among species