#mildew  a fungus that produces a superficial (usually white) growth on organic matter
  supertype:  #fungus  a parasitic plant lacking chlorophyll and leaves and true stems and roots and reproducing by spores
  subtype:  #powdery_mildew__powderymildew  any of various fungi of the genus Erysiphe producing powdery conidia on the host surface
  subtype:  #downy_mildew__downymildew__falsemildew  any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
     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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