Powdery mildew is a fungal plant disease that causes leaves and stems to look like they have a dusting of flour on them. Plant foliage with powdery mildew develops white, chalky-looking patches that make the leaves look diseased. In time, the leaves start to turn yellow and may drop off. Powdery mildew may not kill a plant, but the white, dust-like fungus makes plants look sick.
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