Treating Powdery Mildew and Downy Mildew on Roses

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Michelle Ullman
BellaOnline's Roses Editor

Downy mildew
This serious fungal infection appears as purplish brown spots and blotches on the leaves of the rosebush. As the disease progresses, the blotches become larger and turn black and the area surrounding the lesion turns yellow. Sometimes there will be white powder on the underside of the leaves, but this is not always the case. Eventually, the leaves die and fall from the bush. Untreated, the entire plant can die within days from a severe downy mildew infection.

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