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Potato black scurf
Black scurf of Potato, which is caused by the fungus Rhizoctonia solani Kühn, is a serious disease commonly observed in most potato-producing areas of the world.
Black scurf is the tuber phase of stem canker. Superficial dark brown/ black particles (sclerotia) of variable size and shape that can be removed by rubbing or scratching with the thumb nail.