1a corridor and/or blotch => 2

1b fleck mine => 5

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

2a long, narrow, hardly widening corridor, abruptly changing into a blotch (the corridor may be overrun by the blotch, but is usually recognisable in the frass pattern) => 3

2b broad corridor, may be widenend blotch-like here and there => 4

3a mine begins at a globular shiny egg shell; frass in the corridor in a central line; larva with chitinised head: Glaucolepis headleyella

3b no egg shell; frass in the corridor part in a broad green central band, with tiny black granules at either side; larva a maggot: Amauromyza labiatarum

4a larva without feet: Orthochaetes insignis

4b larva with thoracic feet: Apteropeda globosa & orbiculata

5a larva in a helicoidal case; hole in the mine untidy, angular: Apterona helicoidella

5b larva in a tubular case; hole neatly round: Coleophora albitarsella