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

Derived forms: blue mold fungi

Type of: downy mildew, false mildew

Part of: genus Peronospora, Peronospora

• Sipuncula
• sipunculid
• Siqueiros
• sir
• Sir Alan Hodgkin
• Sir Alec Guinness
• Sir Alexander Fleming
• Sir Alexander Korda
• Sir Alexander Mackenzie
• Sir Alexander Robertus Todd
• Sir Alfred Charles Bernard Lovell
• Sir Alfred Hitchcock
• Sir Angus Wilson
• Sir Anthony Hopkins
• Sir Anthony Philip Hopkins
• Sir Anthony Vandyke
• Sir Arthur Conan Doyle
• Sir Arthur John Evans
• Sir Arthur Stanley Eddington
• Sir Arthur Sullivan
• Sir Arthur Travers Harris
• Sir Barton
• Sir Bernard Law Montgomery
• Sir Bernard Lovell
• Sir Bernard Williams