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 - this leads to two green islands (these may not be so conspicuous). The larva is yellow green and shown in dorsal view (top photo)
and ventral view (bottom photo).

Data: 08.x.2010, Wicken, Cambs, VC29

Image:© Rob Edmunds