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 as shown, with the very early mines in the leaf.

Data: 14.ix.2017, Wicken, Cambs, VC29

Image:© Rob Edmunds