Length 3-4mm. Very similar to P. fraxini but with less intense wing markings. It causes marginal leaf-fold galls on ash leaves, which are pale with reddish/violet marking; the galls cannot be distinguished from others in the Psyllopsis fraxini species aggregate.  The nymphs inside the galls are pale green with black markings and white wax. 

Other Psyllopsis species.

Unless identified by a recognised expert, a photo is required showing the diagnostic features.

Feeds on Ash.

June to October.

Rarely recorded but probably widespread.

Status in Leicestershire and Rutland not known.