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Powdery mildew is a common fungal disease of many landscape plants. It does not cause significant damage to the health of the plant, but affects the look of ornamental plants like roses and purple-leaved ninebarks.
White to gray, powdery spots form on leaves, stems and buds of infected plants. It is often most severe on young leaves and green shoots. Infected leaves may become cupped or twisted and, when severely infected, turn yellow and fall off prematurely during the growing season. In some plants, leaves turn purple to red around the infection. During late summer or early fall, tiny round orange to black balls form within white fungal mats.
There are number of things that can be done to manage powdery mildew.
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