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Blackberry cane spot, a fungal disease sometimes called purple blotch. From about May, round, purple or brown spots appear on leaves. The spots turn grey-white in the centre but remain purple around the edges. On the canes, they are more elliptical in shape and may grow into blotches up to 1cm (1/2in) long. Tiny black specks of fungal growth may be visible in the white centres. In the case of serious infections, leaves and canes may die.