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1. Any of various plant diseases caused by oomycetes and characterized by whitish gray patches of spores on the lower surfaces of leaves.
2. An oomycete causing such a disease.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Plant Pathology) 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
2. (Plant Pathology) any of the fungi causing this disease
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. any common fungus of the family Peronosporaceae, appearing on damp vegetable or animal matter as a white fuzzy mass of spores.
2. a disease of plants caused by growth of downy mildew on the undersurface of the leaves, characterized by crumpling, yellowing, and death of the foliage.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||downy mildew - any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons|
blue mold fungus, Peronospora tabacina - fungus causing a serious disease in tobacco plants characterized by bluish-grey mildew on undersides of leaves
mildew - a fungus that produces a superficial (usually white) growth on organic matter
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