powdery mildew (Podosphaera macularis)

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David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org