The larvae mine the leaves of various Leguminosae such as clovers, melilot and lucerne. It starts as a linear mine. usually running towards the tip of the leaf then turning back a into a blotch in the midrib area.  Frequently, no blotch is formed. 

See the National Agromyzidae Recording Scheme website for further details of puparium and adult insect

Agromyza nana mines can be similar, but the blotch is usually exactly over the midrib. Liriomyza congesta

(ref.: Warrington, B.P. (2023).  Agromyza frontella. Accessed at https://agromyzidae.co.uk/species/agromyzidae/agromyzinae/agromyza/agromyza-frontella/ on 11/12/2023)

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.

Nationally Scarce A.

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

Status in Leicestershire and Rutland not known.