1amine full depth, small, variable in shape; larva a grey caterpillar => 2

1bmine not unusually small, upper- or lower-surface; larva a white maggot => 3

1c galls, etc => Tables for all parasites per species

2alarva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

2bpinacula black: Cnephasia stephensiana

3ablotch: Calycomyza humeralis

3bgallery => 4

4afrass in discrete grains; pupation in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

4bfrass in strings; prior to pupation the larva leaves the mine through a semicircular exit slit => 5

5agallery pinnately branched; main and side branches on top of the midrib and lateral veins: Liriomyza strigata

5bmine not associated with the venation of the leaf => 6

6amine starts as a densely wound spiral that quickly turns brown6: Liriomyza eupatorii

6bno initial spiral; mainly in greenhouses: Liriomyza trifolii