Phylum: Ascomycota	Class: Leotiomycetes
Order: Helotiales	Family: Erysiphaceae
Species: Erysiphe alphitoides (Griffon & Maubl.) U. Braun & S. Takam.

Synonyms:

Erysiphe quercina Llwydni Blodiog y Dderwen Microsphaera alphitoides Microsphaera quercina Microsphaera quercinum Oak Mildew Oak Powdery Mildew Oidium alphitoides Oidium quercinum

Common Name:

Oak Mildew

A Powdery Mildew

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This distribution map was produced using DMap

On Oak, Quercus sp.

Photographer: © David Mitchel

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View this species in its UK context on the NBN Atlas

Associated Species (where recorded) & number of records: Quercus (12) Quercus petraea (4) Quercus robur (3)

Habitat (where recorded) & number of records: Woodland: mixed, semi-natural (4) Parkland and scattered trees: mixed (3) Built up area, domestic (2) Neutral grassland: semi-improved (2) Parkland and scattered trees (2) Woodland: broadleaved, semi-natural (2) Woodland: mixed (2) Maritime cliff and slope: coastal grassland (1) Parkland and scattered trees: broadleaved (1) Scrub (1) Woodland (1) Woodland and scrub (1) Woodland: broadleaved (1) Woodland: broadleaved, plantation (1) Woodland: coniferous, plantation (1) Woodland: mixed, plantation (1)

Substrate (where recorded) & number of records: Leaf (8) Living leaf (8)

Months recorded in & number of records: January (1) July (1) August (8) September (19) October (11) November (1)