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Definition of Onion mildew
1. Noun. Fungus causing a downy mildew on onions.
Exact synonyms: Peronospora Destructor
Group relationships: Genus Peronospora, Peronospora
Generic synonyms: Downy Mildew, False Mildew
Group relationships: Genus Peronospora, Peronospora
Generic synonyms: Downy Mildew, False Mildew