Thread subject: Diptera.info :: Leaf mine ID => Agromyzidae: Chromatomyia horticola/syngenesiae
Posted by Barry on 12-09-2021 20:33
This is probably either Chromatomyia horticola or syngenesiae but the larva has perished. You would need to rear and most likely dissect an adult male to confirm the causer.
My website lists all known Agromyzidae miners on Sonchus;
This website is dedicated to Agromyzidae and is by far the most reliable and up to date resource there is.