Downy Mildew in Cucurbits

Dark purplish gray spores of the downy mildew fungus only develop on lower surfaces of leaves and are easily distinguished from white spores of the powdery mildew fungus. These spores are diagnostic but unfortunately are not always present (see Fig 4). Note that downy mildew lesions usually do not enlarge beyond major veins, giving spots an angular appearance.
Photos Courtesy of M.T. McGrath, Long Island Horticultural Research and Extension Center, Cornell University

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Link to the News Article "Update on Managing Downy Mildew in Cucurbits"

Link to the Factsheet on Assorted Foliar Diseases of Cucurbits

Link to Photo Gallery of Assorted Foliar Diseases of Cucurbits