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2 definitions found
 for powdery mildew
From The Collaborative International Dictionary of English v.0.48 :

  Mildew \Mil"dew\, n. [AS. melede['a]w; akin to OHG. militou, G.
     mehlthau, mehltau; prob. orig. meaning, honeydew; cf. Goth.
     milip honey. See Mellifluous, and Dew.] (Bot.)
     A growth of minute powdery or webby fungi, whitish or of
     different colors, found on various diseased or decaying
     substances.
     [1913 Webster]
  
     powdery mildew a fungal disease of plants caused by an
        ascomycete of the order Erysiphales, characterized by a
        powdery white film on the surface of the affected plants.
        It is damaging to, e.g., roses and lilacs. Also, a fungus
        that causes such a disease.
        [PJC]

From WordNet (r) 3.0 (2006) :

  powdery mildew
      n 1: any of various fungi of the genus Erysiphe producing
           powdery conidia on the host surface

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