Phytoptus tetratrichus

A gall-causer on limes Tilia.

There were lots of these galls on a single lime tree (not certain of the species) but I couldn't see any on the other lime trees in the same copse (I didn't look very hard, but they certainly weren't as obvious as they were on one tree).

Phytoptus tetratrichus galls on lime, Wendling Beck Environment Project (Norfolk, UK), 26th May 2025