downy mildew

noun

Definition of downy mildew

  1. 1 :  any of various parasitic lower fungi (family Peronosporaceae) that produce whitish masses of sporangiophores or conidiophores on the undersurface of the leaves of the host

  2. 2 :  a plant disease caused by a downy mildew

First Known Use of downy mildew

1886


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