This article is about a type of fungal spore. For the ascomycete genus, see Oidium (genus)
Oidium (genus)
Oidium is a genus of Deuteromycetes, where traditionally most anamorphs of the order Erysiphales are included. Most of them are plant pathogens causing different forms of powdery mildew, for example:*Oidium alphitoides Oidium is a genus of Deuteromycetes, where traditionally most anamorphs of the...

. For the fungus that causes powdery mildew on grapes, see Uncinula necator
Uncinula necator
Uncinula necator is a fungus that causes powdery mildew of grape. It is a common pathogen of Vitis species, including the wine grape, Vitis vinifera. The fungus is believed to have originated in North America. European varieties of Vitis vinifera are more or less susceptible to this fungus...


An oidium (plural: oidia) is an asexually produced fungal
A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds , as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria...

In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...

 that (in contrast to conidia) is presumed not to constitute the main reproductive preoccupation of the fungus at that time.
The hypha breaks up into component cells/ small pieces and develop into spores. Oidia can't survive in unfavourable conditions.
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