Golovinomyces cichoracearum is a fungal plant pathogen that causes a powdery mildew on various plants including Prickly Sow-thistle, Nipplewort, melon, cucumber, pumpkin, and squash. The primary symptoms are white, powder-like spots on the leaves and stems.
Sphaerotheca fuliginea causes a similar looking powdery mildew of cucurbits
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.
Wherever the host plants occur.
Summer and early autumn.
It seems to be widespread in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015