The larvae of the fly Liriomyza sonchi form large upper surface blotch mines on the leaves of sow-thistle species. Secondary feeding corridors are often present. Scattered frass can be seen in the mine. Several larvae may feed together in the mine.

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

Liriomyza obliqua / Liriomyza pascuum / Liriomyza puella / Liriomyza scorzonerae / Liriomyza taraxaci.

ref.: Warrington, B.P. (2023).  Liriomyza sonchi . Accessed at https://agromyzidae.co.uk/species/agromyzidae/phytomyzinae/liriomyza/liriomyza-sonchi/ on 13/12/2023)

Leafmine Adult

Adult: Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Leafmine: Please provide a back-lit photograph of the leafmine and state the host plant.

Host plants: Sow-thistles are the most common plants used but the mines have been found a range of others.

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.

Leafmines can mainly be found between June and September.

In Britain the species is classed as Nationally Scarce B.

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

Rarely recorded in Leicestershire and Rutland.