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Webster 1913 Edition


Oidium


O-ïd′i-um

,
Noun.
[NL., dim. fr. Gr.
ω,ὄν
egg.]
(Bot.)
A genus of minute fungi which form a floccose mass of filaments on decaying fruit, etc. Many forms once referred to this genus are now believed to be temporary conditions of fungi of other genera, among them the vine mildew (
Oïdium Tuckeri
), which has caused much injury to grapes.

Definition 2024


Oidium

Oidium

See also: oidium and oïdium

Translingual

Wikispecies

Proper noun

Oidium n

  1. A taxonomic genus within the family Erysiphaceae fungi, mainly comprising plant pathogens causing different forms of powdery mildew.

oidium

oidium

See also: Oidium and oïdium

English

Grapes affected by Erysiphe necator

Noun

oidium (plural oidia)

  1. A fragile spore produced by some fungi.
    • 2003 August, Competition Science Vision, page 802,
      Oidia are hyaline, small and thin-walled unicellular sections or fragments of the mycelium.
      Oidia may be uni- or binucleate as whether they are produced by the breaking up of the primary or secondary mycelium.
    • 2004, P.D. Sharma, The Fungi, page 241,
      However, in some forms mainly some Hymenomycetes it occurs by the formation of oidia. The oidia are of two main types.
    • 2006, A. V. S. S. Sambamurty, A Textbook of Plant Pathology, page 239,
      Later the pods become covered completely with white powdery mass composed of mycelium, oidiophores and oidia of the fungus.
  2. The fungus Erysiphe necator (= Uncinula necator), which produces powdery mildew in grapes.

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