Alder leaf-blister galls

Alder leaf-blister galls

Observation - Alder leaf-blister galls - UK and Ireland. Description: Pale discoloured patches most of which were raised albeit some were flat (photos 3 & 5). On alder leaves.

Pale discoloured patches most of which were raised albeit a few were flat (photos 3 & 5). Found on alder trees growing on a disused coal Bing which is now part of a woodland.