Alliaria
Dichotomous table for leafminers
1a corridor, vanishing into the midrib => 2
1b corridor or blotch, not ending in the midrib => 3
1c galls, etc => Tables for all parasites per species
2a larva a maggot: Phytomyza rufipes
2b larva with sclerotised head: Ceutorhynchus pallidactylus
3a mine full depth; larva with chitinised head => 4
3b mine upper- or lower-surface; larva a headless maggot => 6
4a tiny corridor or blotch, < 5 mm: Plutella xylostella
4b blotch, not preceded by a corridor, with a green centre: Xenostrongylus lateralis
4c corridor, > 10 mm => 5
5a larva without feet; mine an untidy corridor: Ceutorhynchus minutus
5b larva with thoracic feet; latest part of the mine blotchy: Phyllotreta nemorum
6a mine largely a broad corridor or elongated blotch, positioned over the midrib => 7
6b mine not associated with the midrib => 8
7a irregular blotch over the midrib, with few, short side branches without apparent direction; frass in short thread fragments: Liriomyza xanthocera
7b broad corridor over the midrib, its more numerous side branches positioned over the main lateral veins; frass in longer pearl chains: Liriomyza strigata
8a final part of the mine blotchy => 9
8b mine a corridor throughout => 10
9a frass in thread fragments; mines in May-June; larva: rear spiraculum with 3 clear papillae: Liriomyza xanthocera
9b frass in extremely fine grains, concentrated in greenish-black clouds; mines in May-October; rear spiraculum seemingly with 1 pointed papilla: Scaptomyza flava
10a puparium in the mine: Chromatomyia horticola
10b prior to pupation the larva leaves the mine through a semicircular exit slit: Liriomyza bryoniae