Mildew

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mildew

[′mil‚dü]
(mycology)
A whitish growth on plants, organic matter, and other materials caused by a parasitic fungus.
Any fungus producing such growth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

mildew

A fungus that grows and feeds on paint, cotton and linen fabric, etc., which are exposed to moisture; causes discoloration and decomposition of the surface.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Mildew

 

the infection of plants with diseases similar to downy mildew, which is caused by fungi of the order Peronosporales. In Soviet literature the term “mildew” is conventionally used to designate only downy mildew of grapes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Oxalic acid-based cleaners can brighten mildewed surfaces (though not kill the mildew).
Tennyson dwelt on this season of soggy bedding and mildewed Michaelmas daisies just long enough to describe it as "a sick man's room...
I suggest you remove the plants, keeping any which are still productive, and dispose of the mildewed foliage.