Oidium may refer to:
*
''Oidium'' (genus), a genus of fungi in the family Erysiphaceae
*
Oidium (spore)
An oidium (: oidia) is an asexually produced fungal spore that (in contrast to conidia
A conidium ( ; : conidia), sometimes termed an asexual chlamydospore or chlamydoconidium (: chlamydoconidia), is an asexual, non- motile spore of a fungus ...
, a type of fungal spore
*Oidium, a disease of grapes caused by the fungus species ''
Uncinula necator
''Uncinula necator'' (syn. ''Erysiphe 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 Americ ...
'' (
syn. ''Oidium tuckeri'')
{{Disambiguation