The larvae mine the leaves of Hop (Humulus lupulus) creating a long upper surface gallery widening towards the end and with greenish, diffused frass.

See the National Agromyzidae Recording Scheme website for further details

 Agromyza igniceps has similar mines, but they follow a vein for a distance

(ref.: Warrington, B.P. (2023).  Agromyza flaviceps.  Accessed at https://agromyzidae.co.uk/species/agromyzidae/agromyzinae/agromyza/agromyza-flaviceps/ on 10/12/2023)

Leaf-mine Adult

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

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.

Local

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

Status in Leicestershire and Rutland not known.