Oak Mildew - Erysiphe alphitoides

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Alternative names
Microsphaera alphitoides
Description

Erysiphe alphitoides is a fungal rust (a foliar pathogen) that causes a powdery mildew on the leaves of Oak.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. You must state the host plant.

Habitat

Areas where Oak occurs.

When to see it

When Oak is in leaf.

UK Status

Widespread and fairly frequent in Britain.

VC55 Status

Fairly frequent in Leicestershire and Rutland.

  • Graham Calow
    Burbage Common
    04 September 2020
    mildew on Oak
  • steven lewis
    welby
    14 November 2016
  • Graham Calow
    Hinckley, Roston Drive area
    08 October 2022
    holomorph state on Oak

Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2025+ | 2020-2024 | pre-2020

UK Map

Species data profile ?

Species profile

Common names
Oak Powdery Mildew, Oak Mildew
Species group:
Fungi
Kingdom:
Fungi
Order:
Erysiphales
Family:
Erysiphaceae
Records on NatureSpot:
147
First record:
28/09/2014 (Thompson, Peter)
Last record:
29/08/2025 (lemmon, roy)

Total records by month

% of records within its species group

10km squares with records

The latest images and records displayed below include those awaiting verification checks so we cannot guarantee that every identification is correct. Once accepted, the record displays a green tick.

In the Latest Records section, click on the header to sort A-Z, and again to sort Z-A. Use the header boxes to filter the list.

Latest images

Latest records

  • Graham Calow
    Sapcote, Land behind William Spencer Ave
    04 August 2020
    Mildew on Oak
  • Saharima Roenisch
    Sheet Hedges Wood
    20 August 2018
  • Graham Calow
    Footpath behind Stoney Cove
    03 August 2016
    On Pedunculate Oak
  • David Nicholls
    Charnwood Lodge
    17 September 2016
  • Steve Mathers
    Ulverscroft NR
    06 October 2016
  • Steve Mathers
    Beacon Hill CP
    26 September 2017
  • Saharima Roenisch
    Shady Lane Arboretum
    17 August 2018
  • Saharima Roenisch
    Shady Lane Arboretum
    17 August 2018
  • Saharima Roenisch
    Knighton Park
    17 July 2020
  • Melinda Bell
    Bardon,Bardon Hill
    06 August 2020
  • Saharima Roenisch
    Knighton Park
    17 July 2020