The larvae mine the leaves of Teasel. It produces a long mine, which rapidly broadens, at the leaf edge. The mine turns brown.

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

ref.: Warrington, B.P. (2023).  Agromyza dipsaci. Accessed at https://agromyzidae.co.uk/species/agromyzidae/agromyzinae/agromyza/agromyza-dipsaci/ on 13/12/2023)

None - the mine is distinctive, but may be confused with leaf decay; check that there is frass in the mine. 

Leaf-mine Adult

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

Where Wild Teasel 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.

Nationally Scarce B

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

Status in Leicestershire and Rutland not known.