Erysiphe knautiae


Erysiphe knautiae is a powdery mildew which affects plants in the Scabious family, appearing as a powdery white substance particularly on both surfaces of the leaves. Microscopic examination is needed to separate this mildew from Podosphaera dipsacacearum.

Similar Species

Podosphaera dipsacacearum is similar but the conidia of Erysiphe knautiae haven't got fibrosin bodies in them, just the usual cell contents – these are present in the conidia of P. dipsacacearum

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required, and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


Affects plants in the Scabious family.

When to see it

When Scabious are in leaf.

UK Status

It appears to be widespread in Britain

VC55 Status

Rarely recorded in Leicestershire and Rutland.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Species group:
Records on NatureSpot:
First record:
21/09/2023 (Calow, Graham)
Last record:
21/09/2023 (Calow, Graham)

Total records by month

% of records within its species group

10km squares with records

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