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Noun: blue mould fungus
Usage: Brit, Cdn (US: blue mold fungus)
  1. Fungus causing a serious disease in tobacco plants characterized by bluish-grey mildew on undersides of leaves
    - blue mold fungus [US], Peronospora tabacina

Derived forms: blue mould fungi

Type of: downy mildew, false mildew

Part of: genus Peronospora, Peronospora