downy mildew
noun Date: 1886 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. a plant disease caused by a downy mildew

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • downy mildew — ☆ downy mildew n. a disease of angiosperms characterized by the appearance of whitish or downy patches of fungus on the surfaces of plant parts, caused by various fungi (family Peronosporaceae) …   English World dictionary

  • Downy mildew — Example of Downy mildew (left) along with powdery mildew on a grape leaf Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to Peronosporaceae. In commercial… …   Wikipedia

  • downy mildew — 1. Also called false mildew. any fungus of the family Peronosporaceae, causing many plant diseases and producing a white, downy mass of conidiophores, usually on the under surface of the leaves of the host plant. 2. Plant Pathol. a disease of… …   Universalium

  • downy mildew — down′y mil′dew n. 1) fng any common fungus of the family Peronosporaceae, appearing on damp vegetable or animal matter as a white fuzzy mass of spores 2) ppa a disease of plants caused by growth of downy mildew on the undersurface of the leaves,… …   From formal English to slang

  • downy mildew — /daʊni ˈmɪldju/ (say downee mildyooh) noun fungi belonging to the family Peronosporaceae, all of which are obligate parasites of vascular plants, as Plasmopara viticola, downy mildew of grapes …   Australian English dictionary

  • downy mildew — noun any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons • Syn: ↑false mildew • Hypernyms: ↑mildew • Hyponyms: ↑blue mold fungus, ↑Peronospora tabacina, ↑onion mildew, ↑ …   Useful english dictionary

  • downy mildew — false mildew a mildew of the family Peronosporaceae …   Medical dictionary

  • Mildew — Example of downy mildew (left) along with powdery mildew on a grape leaf …   Wikipedia

  • mildew — mildewy, adj. /mil dooh , dyooh /, n. 1. Plant Pathol. a disease of plants, characterized by a cottony, usually whitish coating on the surface of affected parts, caused by any of various fungi. 2. any of these fungi. Cf. downy mildew, powdery… …   Universalium

  • mildew — mil•dew [[t]ˈmɪlˌdu, ˌdyu[/t]] n. 1) ppa a disease of plants, characterized by a cottony, usu. whitish coating on the affected parts, caused by any of various fungi 2) fng any of these fungi, esp. downy mildew or powdery mildew 3) fng any similar …   From formal English to slang

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