Spring is in the air – and so is powdery mildew. This is the type of weather it loves. Watch for signs of this fungal disease on roses, grapes and ornamental shrubs, particularly on new leaves.

Our recent spate of hot and cold weather has brought out a late outbreak of powdery mildew. Leaves on roses, lupines, phlox, squash, melons and even maple trees have all picked up the telltale ...

On languid summer days, a milky, sometimes splotchy film of dusty white or gray often creeps over the leaves of trees, shrubs and perennials. This is powdery mildew, one of the most common fungus ...

Under moist conditions, you might see a gray, downy-looking growth on the undersides of the leaves. As the name suggests, powdery mildew shows up as a white powder covering the leaves, but without ...

Researchers are now analyzing volatile chemicals emanating from grape leaves infected by a fungus called powdery mildew with the goal of improving training for vineyard canines. Nayelly Rangel, a ...