#downy_mildew__downymildew__falsemildew  any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
  supertype:  mildew  a fungus that produces a superficial (usually white) growth on organic matter
  member of:  family_Peronosporaceae
  subtype:  blue_mold_fungus__Peronospora_tabacina  fungus causing a serious disease in tobacco plants characterized by bluish-gray mildew on undersides of leaves
  subtype:  onion_mildew__onionmildew__peronosporadestructor  fungus causing a downy mildew on onions
  subtype:  tobacco_mildew__tobaccomildew__Peronospora_hyoscyami  fungus causing a downy mildew on growing tobacco

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