Lycopus gipsywort
Dichotomous table for leafminers
1a fleck mine, the larva mines from a transportable case => 2
1b gallery or blotch mine; the larva mines from within => 3
1c galls, etc => Tables for all parasites per species
2a brownish black sheath case: Coleophora albitarsella
2b composite leaf case (occurence on this host plant not quite certain): Coleophora pennella
3a mines tiny, usually several on a leaf, of undefinite shape; larvae with chitinised head => 4
3b mines not remarkably small, one per leaf, a gallery or blotch; larva a (seemingly) headless maggot => 6
4a larvae colourless, without feet; older larvae live free and cause window feeding: Phytosciara halterata
4b larvae dark in colour, with thoracic feet; older larvae live free among spun leaves => 5
5a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana
5b pinacula black: Cnephasia stephensiana
6a long, hardly widening corridor, abruptly widening into (and later overrun by) a large blotch: Amauromyza labiatarum
6b corridor from start to end, or becoming a secondary blotch => 7
7a corridor not contorted: Chromatomyia horticola
7b corridor strongly contorted, often a secondary blotch: Phytomyza lycopi