Powdery Mildew - Erysiphe cichoracearum

''Erysiphe cichoracearum'' is a plant pathogen that causes powdery mildew disease of cucurbits, including melon, cucumber, pumpkin, and squash. The primary symptoms are white, powder-like spots on the leaves and stems. ''Sphaerotheca fuliginea'' causes a similar looking powdery mildew of cucurbits.