Oidium may refer to:
- Oidium (genus), a genus of fungi in the family Erysiphaceae
- Oidium (spore), a type of fungal spore
- Oidium, a disease of grapes caused by the fungus species Uncinula necator (syn. Oidium tuckeri)
|This disambiguation page lists articles associated with the title Oidium.
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