1a fleck mine: Coleophora vicinella

1b gallery or blotch => 2

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

2a larvae with distinct head and feet; older larvae live free among spun leaves => 3

2b the larvae, maggots, mine all their life => 6

3a larvae with whitish markings: Aproaerema anthyllidella

3b larvae without white markings => 4

4a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

4b pinacula black => 5

5a larva: behind/below the anus a chitinous comb: Cnephasia asseclana

5b anal comb absent: Cnephasia stephensiana

6a frass in a broad green band, fine black granules at either side: Liriomyza congesta

6b frass in black grains or strings => 7

7a frass in isolated, well-spaced grains; pupation in the mine, in a, generally lower-surface, pupal chamber: Chromatomyyia horticola

7b frass in strings; pupation external => 8

8a mine pinnately branched, main and side branches on top of midrib and side veins: Liriomyza strigata

8b mine little branched, no relation with the venation of the leaf: Liriomyza bryoniae