(redirected from mildews)
Also found in: Dictionary, Thesaurus, Medical.


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
..... Click the link for more information.
. 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).
..... Click the link for more information.
, 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.
..... Click the link for more information.
, phylum (division) Oomycota.



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.


A whitish growth on plants, organic matter, and other materials caused by a parasitic fungus.
Any fungus producing such growth.


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.
References in periodicals archive ?
If I was asked to choose between the 250 species of asters it would be these, all of which I grow without troublesome mildew or spraying, in well-drained soil that retains sufficient moisture throughout the growing season.
But impatiens downy mildew was already active in Florida when the year began, says plant pathologist Colleen Warfield of Ball Horticultural Company, a Chicago-based plant breeder and distributor.
We can't expect rose powdery mildew to behave exactly as the grape species.
Research has shown that temperatures between 18 [degrees] C and 27 [degrees] C for several hours are better for powdery mildew to reproduce and spread in roses," says Bolkan.
We're also looking at leaf wetness, because powdery mildew can't grow on totally saturated leaves.
Mildew can be combated even more easily now with a brand new line of powerful products -- all of which contain that same special chemical.
While bleach may temporarily remove the discoloration caused by mold, the organization said only EPA-registered mold and mildew products labeled as a cleaner, disinfectant, fungicide and/or mildewstat are truly effective at killing the micro-flora that can enable mold to grow, and make property potentially uninhabitable.
Widespread recommended use of bleach alone in post-Katrina New Orleans is believed to have had devastatingly negative effects on owners' and renters' abilities to reclaim their homes, because of bleach's inability to prevent mold and mildew re-growth.