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downy mildew
[ dou-nee mil-doo, -dyoo ]
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.
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
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.
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Word History and Origins
Origin of downy mildew1
First recorded in 1885–90
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How does downy mildew compare to similar and commonly confused words? Explore the most common comparisons:
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Example Sentences
Downy mildew spreads and does most damage in hot wet weather.
From Project Gutenberg
Spraying with bordeaux mixture as indicated for black-rot will keep downy mildew in check.
From Project Gutenberg
Practice clean cultivation from the very beginning in order to help control black rot and downy mildew.
From Project Gutenberg
The berries, however, do not become soft and shrunken as when attacked by the downy-mildew.
From Project Gutenberg
The two leaf troubles are respectively known as blight or downy mildew and the Macrosporium disease.
From Project Gutenberg
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