oidio
Oidio, commonly known as powdery mildew, is a group of fungal diseases that affect a wide range of plants. The term refers to the asexual forms formerly placed in the form-genus Oidium; modern taxonomy assigns the causal agents to several genera within the order Erysiphales, including Erysiphe, Golovinomyces, Leveillula and Sphaerotheca. Oidio is prevalent in temperate and subtropical regions and can attack leaves, shoots, flowers and fruits.
Symptoms appear as white to gray, talc-like powders on leaf surfaces, often starting on the upper side.
Powdery mildews are largely host-specific but many species can infect multiple plant groups, including grapes, roses,
Management focuses on cultural practices to improve air circulation, remove infected tissues, and plant resistant varieties