1a fleck mine => 2

1b corridor or blotch => 4

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

2a case with a dorsal keel that soon, already before halfway to the end, is split into two parallel keels: Coleophora lithargyrinella

2b dorsal keel, if at all present, not divided => 3

3a sharp bend just behind the mouth, mouth angle therefore 30°: Coleophora chalcogrammella & C. sattleri

3b case straight, mouth angle 45°: Coleophora solitariella

4a larva with distinct, chitinised head: Aphytobius sphaerion

4b larva a seemingly headless maggot => 5

5a larva also mines the top of the stem, causing this part of the plant to wilt: Delia echinata

5b larva in the leaves only: Scaptomyza graminum