downy mildew

noun

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.

Plant Pathology. a disease of plants, characterized by mildewed, distorted, and yellowed foliage, caused by any of several fungi of the family Peronosporaceae, as of the genera Peronospora and Phytophthora.

Origin of downy mildew

First recorded in 1885–90

Words nearby downy mildew

downwash, downwelling, downwind, down with, downy, downy mildew, downy woodpecker, downzone, dowry, dowsabel, dowse

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for downy mildew

Downy-mildew, like black-rot, spreads most rapidly and does most injury in hot, wet weather.
Manual of American Grape-Growing|U. P. Hedrick
The berries, however, do not become soft and shrunken as when attacked by the downy-mildew.
Manual of American Grape-Growing|U. P. Hedrick
Downy-mildew (Plasmopara viticola) rivals black-rot for first place among fungous diseases of the grape.
Manual of American Grape-Growing|U. P. Hedrick

British Dictionary definitions for downy mildew

downy mildew

noun

a serious plant disease, characterized by yellowish patches on the undersurface of the leaves, caused by the parasitic fungi of the family Peronosporaceae, such as Peronospora destructor: affects onions, cauliflower, lettuce, etc

any of the fungi causing this disease

Compare powdery mildew

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for downy mildew

downy mildew

[ dou′nē ]

A disease of plants caused by oomycete organisms of the order Peronosporales and characterized by gray, velvety patches of spores on the lower surfaces of leaves. Downy mildew of the grapevine nearly destroyed the French wine industry in the 1870s, spurring the development of the first chemical pesticides used on plants.

单词	downy mildew
释义	downy mildew noun 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. Plant Pathology. a disease of plants, characterized by mildewed, distorted, and yellowed foliage, caused by any of several fungi of the family Peronosporaceae, as of the genera Peronospora and Phytophthora. Origin of downy mildew First recorded in 1885–90 Words nearby downy mildew downwash, downwelling, downwind, down with, downy, downy mildew, downy woodpecker, downzone, dowry, dowsabel, dowse Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for downy mildew Downy-mildew, like black-rot, spreads most rapidly and does most injury in hot, wet weather. Manual of American Grape-Growing\|U. P. Hedrick The berries, however, do not become soft and shrunken as when attacked by the downy-mildew. Manual of American Grape-Growing\|U. P. Hedrick Downy-mildew (Plasmopara viticola) rivals black-rot for first place among fungous diseases of the grape. Manual of American Grape-Growing\|U. P. Hedrick British Dictionary definitions for downy mildew downy mildew noun a serious plant disease, characterized by yellowish patches on the undersurface of the leaves, caused by the parasitic fungi of the family Peronosporaceae, such as Peronospora destructor: affects onions, cauliflower, lettuce, etc any of the fungi causing this disease Compare powdery mildew Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for downy mildew downy mildew [ dou′nē ] A disease of plants caused by oomycete organisms of the order Peronosporales and characterized by gray, velvety patches of spores on the lower surfaces of leaves. Downy mildew of the grapevine nearly destroyed the French wine industry in the 1870s, spurring the development of the first chemical pesticides used on plants. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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