1a pupation in the mine, in a, generally lower-surface, pupal chamber; frass in widely isolated grains: Chromatomyia horticola

1b pupation external; frass grains at leasty partly connected, in strings or pearl chains => 2

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

2a corridor from start to end (possibly a secondary blotch in the end): Liriomyza bryoniae

2b corridor finally widens into an elongate primary blotch on top of the midrib: Liriomyza xanthocera