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Vernacular names
• Deutsch: Falsche Mehltaue
• English: downy mildews
Peronospora tabacina symptoms on tobacco (click on image to enlarge it)
Source: Clemson University - USDA Cooperative Extension Slide Series - IPM Images

Peronosporales - (downy mildews)

This order includes oomycetes causing important plant diseases like downy mildews and white rusts. The group is closely related to the Pythiales (with the genera Phytophthora and Pythium) and the correct taxonomic organization of these two orders is still under discussion.

The following genera are currently entered under Peronosporales: