Powdery mildew of Mint
Erysiphe chicoracearum
Powdery mildew appears on mint leaves, stems, and petioles as a powdery, white to gray coating of fungal mycelium and spores. Infections consist of discrete circular colonies of up to ½ inch in diameter and can become numerous, coalesce and spread over the entire plant. Colonies turn gray with age. Leaves may turn yellow and drop with severe infections.
