Food Plant: Populus canescens (Grey Poplar)  

Egg: Laid on the petiole.

Mine: July - October

Notes: A gall in petiole, later mine in leaf-blade, in “green island”. An egg may be laid either side of the petiole and two mines subsequently develop - note the two green islands (these may not be so conspicuous).

Data: 30.x.2003,Castle Ashby, Northants, VC32

Image:© David Manning