1a large, rounded, primary blotch: Trachys troglodytiformis

1b corridor, or elongate and branched blotch => 2

1c gallen etc => Tabellen voor alle parasieten per soort

2a corridor from begin to end; pupation in the mine, in a, generally lower-surface, pupal chamber: Chromatomyia horticola

2b corridor that develops into an elongate blotch, with side branches; pupation guenerally outside the mine: Liriomyza xanthocera