Pentaglottis alkanet
Dichotomous table for leafminers
1a fleck mine: Coleophora pennella
1b eventually a blotch => 2
1c galls, etc. => Tables for all parasites per species
2a larva solitary (always?): Agromyza myosotidis
2b larva communal => 3
3a larva a white maggot, without feet: Agromyza abiens
3b larva white or full grown, red, with feet and a sclerotised head: Dialectica imperialella