Diptera: Cecidomyiidae - gall midge Drisina glutinosa Photographs on Acer pseudoplatanus, Sycamore Main host: Acer pseudoplatanus. Also occurs on Acer monspessulanum, opalus, platanoides Causes slight bulges on the upperside of the leaf, each with a single white larva present (very briefly) in May in the depression on the underside

Drisina glutinosa
Badbury Rings, Dorset. June 2019