Food Plant: Populus canescens (Grey Poplar)  

Egg: Laid on the petiole, about 15 -20 mm from the leaf blade (as shown) Note the gallery leading left, from the egg, towards the leaf blade.

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 egg is laid on the side of

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

Image:© Rob Edmunds