Suspected to be on dame's rocket
Host - https://www.inaturalist.org/observations/143237298#activity_identification_e3a2e7b1-6122-4f6a-bcc2-ee328559b07c
Edge of woodland heavily trodden I think this is powdery mildew on garlic mustard. Erysiphe cruciferarum is a likely pathogen but I won't put that into the taxo.
Seems to have destroyed a clump or two of this Pseudofumaria lutea.
Powdery mildew on dames rocket
On garlic mustard
Type of powdery mildew, perhaps on Alliaria petiolata
Little hard to see but toward the top on the right side
Assuming this is in the mustard family.
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