1a blotch or tentiform mine; larva with chitinised head => 2

1b very long upper-surface corridor, widened towards the end but not forming a blotch; larva a maggot: Agromyza trebinjensis

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

2a the larva mines all its life, then pupates within the mine: Phyllonorycter millierella

2b the older larva vacates its mine, from then on living in a rolled leaf margin: Caloptilia fidella