mildew

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mildew,

name for certain fungi and protists, for the diseases they cause in various crops, and for the discoloration (and sometimes the weakening and disintegration) they cause in such materials as leather, fabrics, and paper. The powdery mildews usually grow on the surface of plant tissues, forming a gray or white coating and absorbing nourishment from the host. Although traditionally considered fungi, the downy mildews are now more often considered protists. They attack grapes, cucumbers, potatoes, and other vegetables. Methods of making fabrics and leather resistant to mildew have been devised. For the occurrence and control of mildews in agriculture, see diseases of plantsdiseases of plants.
Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rotting of harvested crops in storage or transport is similar to the rots
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. Powdery mildews are classified in the kingdom FungiFungi
, kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites, symbionts, or saprobes (see saprophyte).
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, phylum (division) Ascomycota; downy mildews are classified in the kingdom ProtistaProtista
or Protoctista
, in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms.
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, phylum (division) Oomycota.

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.

mildew

[′mil‚dü]
(mycology)
A whitish growth on plants, organic matter, and other materials caused by a parasitic fungus.
Any fungus producing such growth.

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.