The larvae of the fly Aulagromyza tremulae mine the leaves of Aspen (and possibly Black Poplar). The mine is a long winding gallery on the underside of the leaf.

See the National Agromyzidae Recording Scheme webpage for this species for further details of puparium and adult insect

Aulagromyza populi and Aulagromyza populicola

ref.: Warrington, B.P. (2023).  Aulagromyza tremulae. Accessed at https://agromyzidae.co.uk/species/agromyzidae/phytomyzinae/aulagromyza/aulagromyza-tremulae/ on 12/12/2023)

Leaf-mine Adult

Provide backlit photographs of the whole leaf-mine in the leaf, and the larva, and note the host plant

Where aspen occurs.

Click on the 'further details' link in the 'Description' section above.  Then click on the Phenology tab which will provide phenology details for both adult and larval stages.

The leafmine may be found between June and November.

Nationally Scarce B.

Warrington, B. P. 2022. A provisional review of the status of Agromyzidae in Great Britain & Northern Ireland

Fairly frequent in Leicestershire and Rutland.

http://www.leafmines.co.uk/html/Diptera/A.tremulae.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/diptera/brachycera/agromyzidae/phytomyzinae/aulagromyza/aulagromyza-tremulae/