Peronospora destructor

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Peronospora destructor - symptoms on onion (click on image to enlarge it)
Author(s): Gerald Holmes, Valent USA Corporation
Source: IPM Images

Peronospora destructor (Berk.) Caspary

The oomycete causes downy mildew on garlic and onions. It is widely distributed and can cause epidemics under cool and humid conditions.

For details see the respective page in Wikipedia.

Vernacular names
• Deutsch: Falscher Mehltau der Zwiebel
• English: downy mildew of onion
• Español: mildiú de las cebollas
• Français: mildiou de l'oignon