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Field symptoms of bacterial ring rot caused by Clavibacter sepedonicus on aerial parts of potato plants. Interveinal spaces of the leaves become light green to pale yellow (a). Leaves then start to wilt and became slightly rolled at the margins (b). As the disease progresses, leaves become necrotic, starting from the margins (c). Infected leaves are often reduced in size and plants are occasionally stunted or even may eventually die (d)
