Erysiphe syringae is a white, powdery mildew affecting Lilac and producing an opaque-white discoloration of the leaves. Care – there are other similar mildews that may affect Lilac and microscopic examination is necessary.
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.
The mildew can be found on Lilac, the host species.
When Lilac is in leaf, particularly from late summer.
True status in Britain is difficult to determine due to lack of records, but it would seem to be widespread in England, and probably fairly common.
Rarely recorded in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015