Q: What is this fungus on the leaves of my shrub, and how do I treat it? – Brian K. A: The shrub is a ninebark, which is a common and important landscape shrub, and many different named cultivars are ...

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 ...

Prevention is key to managing this widespread plant disease. Powdery mildew is a common fungal disease that affects a wide range of plants, identifiable by white to gray powdery spots on plant ...

Dr. Elizabeth Yuko is a bioethicist and adjunct professor of ethics at Fordham University. She has written for The New York Times, The Washington Post, The Atlantic, Rolling Stone, CNN & Playboy. May ...

Answer: It sounds like your Veronica (speedwell) and Phlox plants have powdery mildew — a very common disease found on ornamental plants. Powdery mildews are host specific, so the powdery mildew ...

The grayish white powdery growth you are seeing on the dahlia leaves is caused by a fungus and can also be a common garden problem on other plants. Many species of fungi can cause powdery mildew on ...

Dear Master Gardener: My Veronica plants have a white powder all over the leaves, but none of my other plants have it. What is wrong with the Veronica and should I do something about it? Answer: It ...

“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 ...