Biscutella

Dichotomous table for leafminers

1a mine full depth; larva with chitinised head => 2

1b mine upper- or lower-surface (small patches may be full depth); larva a maggot => 5

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

2a small blotch, < 1 cm; larva lives later free: Plutella xylostella

2b mine > 1 cm, may be a corridor; larva remains in the mine till pupation => 3

3a larva without feet; mine an untidy corridor: Ceutorhynchus minutus

3b larva with thoracic feet => 4

4a mine contains clear amounts of frass; final part of the mine widened into an elongate blotch: Phyllotreta nemorum

4b mine mostly without frass; corridor, not widenend in the end; alpine species: Psylliodes toelgi

5a corridor from start to end => 6

5b irregular blotch, preceded by a narrow corridor => 7

6a pinnately branched corridor, main branch overlying the midrib: Liriomyza strigata

6b corridor little branched, not associated with the midrib: Chromatomyia horticola

7a frass in thread fragments; mine in May-June: Liriomyza xanthocera

7b frass powdery, in blackish-green clouds; mine in May-October: Scaptomyza flava

mod 9.x.2017