Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales. Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots.. Downy mildew is NOT a fungus. It belongs to a different group of fungus-like organisms called "Oomycetes" (right). Powdery mildew IS a true fungus, belonging to the kingdom "Fungi" (right). The term "fungicide" is misleading since some fungicides are designed to work on fungi and some to work on oomycetes. Most modern fungicide.

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The white sporulation of powdery mildew covers much of both the lower and upper sides of the leaf. Downy mildews are favored by cool, moist conditions while powdery mildew are favored by warm, dry conditions. Downy mildew spores are produced on branched stalks that look like little trees, whereas powdery mildew spores occur in chains on a.. Powdery mildew thrives in warm, dry, humid weather. The ideal temperature for it's growth is between 21-27C (70-80°F) but once the temperatures go above 32°C (90°F) the fungal spread slows down or stops. Unlike most fungi, powdery mildew does not require wet leaves in order to germinate, just high humidity.