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” (as shown). An egg may be laid either side of the petiole and two mines subsequently develop.

Data: 03.x.2019, Wicken, Cambs, VC29

Image:© Rob Edmunds