Because powdery mildew does not significantly affect the health of most plants, treatment is seldom necessary or practical in the home garden. Many gardeners learn to live with the appearance of ...

“My red rhododendron looks as if it has a layer of ash or white powder on it (above). What should I do?” asks Birds & Blooms reader Steven Graves of Aptos, California. Horticultural expert Melinda ...

You might be noticing powdery mildew (a disease that causes a grayish, powdery film on leaves) in your garden. Common plants that could be affected are lilacs, phlox, bee balm, zinnias and nannyberry ...

Powdery mildew is a fungal disease affecting many plants, causing a white or gray coating on leaves and slowing growth. The fungus thrives in warm, dry weather with high humidity, especially in ...