Powdery mildew of numerous plants.
Powdery mildew is a common disease name caused by several different fungi.
Important powdery mildew genera include Erysiphe, Sphaerotheca, Phyllactinia, Microsphaera, Podosphaera, and Uncinula . The most commonly seen stage of powdery mildew is the imperfect or conidial stage which is most commonly the genus Oidium. Regardless which fungus is causing powdery mildew disease on a particular host, the symptoms are almost always the same. White to gray powdery patches are seen on affected plant tissues. Powdery mildew infects leaves, flowers, stems and fruits of numerous vegetables, fruits, trees, flowers, cereals, and other field crops.