false mildew

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Noun1.false mildew - any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
family Peronosporaceae, Peronosporaceae - parasitic fungi: downy mildews
blue mold fungus, Peronospora tabacina - fungus causing a serious disease in tobacco plants characterized by bluish-grey mildew on undersides of leaves
onion mildew, Peronospora destructor - fungus causing a downy mildew on onions
Peronospora hyoscyami, tobacco mildew - fungus causing a downy mildew on growing tobacco
mildew - a fungus that produces a superficial (usually white) growth on organic matter
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