Peronospora hyoscyami

Definitions of Peronospora hyoscyami
  1. noun
    fungus causing a downy mildew on growing tobacco
    synonyms: tobacco mildew
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    type of:
    downy mildew, false mildew
    any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
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