Oïdium: Also known as powdery mildew, oïdium is a fungal disease that infects areas of green growth on grape vines, particularly Vitis vinifera varieties. Grapes afflicted with the powdery or ...

Phillip Lujan, plant pathologist and assistant professor at New Mexico State University, calls powdery mildew and downy mildew "two of the most devastating diseases found in grapes." That's ...