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Powdery mildew on a 'Blackberry. Nip; rose bush. Powdery mildew is not a single disease but a range of fungal problems of the order. Erysiphales that are usually specific to a family of plant hosts. They are, however, generally similar in appearance, characterised by the powdery white or pale grey deposit that forms mainly on the upper surfaces of the leaves or sometimes on fruit. pests-and-diseases-3512htm'>Plant. Pests and Diseases
