Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A thin-walled spore produced by fragmentation in certain filamentous fungi.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fragile spore produced by some fungi
  • n. A fungus, Uncinula necator , that produces powdery mildew in grapes

Etymologies

New Latin Ōidium, fungus genus, from Greek ōion, egg; see oo-.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • It is a fact of some interest in agricultural economy, that the oidium, which is so destructive to the grape, has produced no pecuniary loss to the proprietors of the vineyards in France.

    Earth as Modified by Human Action, The~ Chapter 02 (historical)

  • Read More Drinking Now: Synchronicity Its downfall came in the form of two fungal diseases that ripped through the vineyards—first oidium, which at the height of its powers, effects grape ripening; followed by phylloxera, a root-feeding aphid that destroys vines.

    The Grape of Good Hope

  • "Powdery mildew" (oidium) has been controlled primarily with sulfites.

    John Tepper Marlin: Green Edge 2: Organic Wine-Making

  • Thus, for example, I have found that as oidium and phylloxera are more effective than severe punishments in diminishing the number of assaults and cases of unlawful wounding, so famine succeeds better than the strongest bars, or dogs kept loose in the prison yards, in preventing the escape of prisoners, who at such times are detained by the advantage of being supported at the public expense.

    Criminal Sociology

  • Added to this, the one source of wealth, agriculture, was almost ruined by the oidium disease which destroyed the vines, and by harvests so bad that the like had not been seen since the celebrated scarcity which followed the wars of Napoleon.

    Cavour

  • But in doing this, we have so lowered the general constitutional vigour of the plants or animals that our vines fall an easy prey to oidium and phylloxera, our potatoes to the potato disease and the Colorado beetle; our sheep are stupid, our rabbits idiotic, our domestic breeds generally threatened with dangers to life and limb unknown to their wiry ancestors in the wild state.

    Falling in Love With Other Essays on More Exact Branches of Science

  • For years the plant has constantly been treated against oidium with antiseptics, which destroy the spores and germ-growths; and we can hardly expect a first-rate yield from a chronically-diseased stock.

    To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I

  • Campanario, famous for its huge Spanish chestnut: both were, however, wasted by the oidium of 1852.

    To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I

  • Such of us as associate their earliest recollections of the name with the annual cask of wine will read with interest that though the wine, thanks to the oidium or some malady of that sort, is a thing of the past, the spot retains many other charms ample to justify a trip to its shores by a more roundabout way than the slow and direct or costly and circuitous routes laid down by Mr. Benjamin.

    Lippincott's Magazine, Vol. 22, September, 1878

  • "carpospores" or possibly chlamydospores similar to the endospores of yeast. [v. 03 p. 0157] The former also looks on the ordinary disjointing bacterial cell as an oidium, and it must be admitted that since Brefeld's discovery of the frequency of minute oidia and chlamydospores among the fungi, the probability that some so-called bacteria -- and this applies especially to the branching forms accepted by some bacteriologists -- are merely reduced fungi is increased.

    Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"

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