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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.



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 ?
EOs and CWM in the control of soybean powdery mildew severity under greenhouse and mechanism of action in vivo
All leaflets were evaluated in each experimental plot with a powdery mildew severity diagrammatic scale for common bean (AZEVEDO, 1997) adapted to soybean.
Lab studies proved what we first suspected: The dose of myclobutanil, the active ingredient in Rally required to provide a given level of control of the powdery mildew fungus, is many times greater than the dose of DFZ necessary to give the same control, yet their commercial products deliver comparable amounts of each in the field.
Performance of DMI products has been "slipping," but DFZ products provided almost complete powdery mildew control in trials.
In the first experiment, the greater number of mites on plants with domatia relative to plants without domatia did not translate into reduced incidence of mildew; mites reduced mildew to very low levels in both treatments.
Recently, however, we have shown that one species of microbivorous mite (Orthotydeus lambi, Tydeidae) is a potent consumer of grape powdery mildew, an important foliar pathogen of cultivated and wild grapes (English-Loeb et al.
Powdery mildew, downy mildew and rust fungi are phylogenetically unrelated biotrophs that are difficult to culture extensively in vitro.
pisi, there is a need of a reliable and reproducible method of screening for powdery mildew.
Selection of lines containing major Pm genes in breeding nurseries in the mid-Atlantic states is facilitated by annual powdery mildew epidemics, but selection of lines containing pyramids of Pm genes necessitates the use of molecular markers linked to resistance genes.
We can't expect rose powdery mildew to behave exactly as the grape species.
Tanos: This is a strobilurin-like fungicide with very good activity against downy mildew only.