1a larva a maggot; parts of the mine are not full depth: Scaptomyza flava

1b larva with chitinised head; mine full deptth => 2

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

2a larva with thoracic feet and prolegs: Plutella xylostella

2b larva with thoracic feet only: Phyllotreta nemorum

2c neither thoracic feet nor prolegs present => 3

3a larvae mine all their life: Ceutorhychus minutus

3b larvvae soon leave their mine and start causing window feeding: Phytosciara halterata