Marrubium white horehound

Dichotomous table for leafminers

1a fleck mine; larva mines from a trnasportable case => 2

1b blotch, may be preceded by a corridor => 4

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

2a lobe case: Coleophora lineolea

2b composite leaf case => 3

3a case composed of a series of many (c. 15) leaf fragments: Coleophora onopordiella

3b … less then 10 leaf fragments: Coleophora ballotella

4a large blotch, no trace of an initial corridor => 5

4b blotch, preceded by a long, hardly widening, corridor (may be overrun by the later blotch, but recognisable from the frass pattern when lighted from behind) => 6

5a at the start of the mine the oviposition site is covered by a shining black drop of dried secretion: Trachys goberti

5b no such drop: Dibolia depressiuscula, cynoglossi

6a frass in the corridor part in a broad green central band, with tiny black granules at either side: Amauromyza labiatarum

6b frass in the corridor in black grains or thread fragments => 7

7a frass in the entire corridor as neat thread fragments, alternating along the sides: Amauromyza lamii

7b frass in the corridor in shorter, untidily arranged thread fragments; towards the end more in grains: Amauromyza morionella

mod 6.iv.2018