- downy mildew, false mildew - any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
--1 is a kind of mildew
--1 is a member of Peronosporaceae, family Peronosporaceae
--1 has particulars:blue mold fungus, Peronospora tabacina; onion mildew, Peronospora destructor; tobacco mildew, Peronospora hyoscyami