Downy Mildew vs. Powdery Mildew Downy mildew and powdery mildew are two common plant diseases, but they are caused by different fungi and have distinct symptoms and characteristics. Downy mildew is caused by the Oomycete pathogen and is characterized by discolored blotches on the upper leaf surface and a mold-like growth on the underside of the leaf.. Powdery Mildew vs Downy Mildew. When dealing with disease in the garden, it is always best to know what you're up against before you start treating. Keeping symptoms straight can be confusing, and keeping names straight adds another layer of deduction. Downy mildew or powdery mildew—while both are called "mildew," there are differences.

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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.. March 18, 2008. Downy mildew and powdery mildew are diseases that may look similar at first glance, but are actually very different. Both usually affect only the leaves, but downy mildew can be identified from the fungal layer on the underside of leaf, that develops in moist weather and is accompanied by leaf spots on the top of the leaf.