1a pinnately branched gallery, main and secondary branches on top of midrib and side veins: Liriomyza strigata

1b blotch or little, not pinnately branched, gallery; mine not determined by the leaf venation => 2

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

2a larvae are maggots; mine entirely or partly upper- or lower-surface: Scaptomyza flava

2b larvae with chitinised head; mine full depth => 3

3a larva with abdominal prolegs => 4

3b no prolegs => 5

4a mines < 1 cm; older larvae live free at the underside of the leaf: Plutella xylostella

4b mines larger: Selania leplastriana

5a larva with thoracic legs: Phyllotreta nemorum

5b larva without legs: Ceutorhynchus minutus