Peltaria garlic cress

Dichotomous table for leafminers

1a short gallery, that ends or begins on a thick vein; the larva essentially lives as a borer in the veins, petiole, or stem => 2

1b the larva does not mine in (though sometimes upon!) the veins => 3

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

2a larva a maggot: Phytomyza rufipes

2b larva with chitinised head: Ceutorhynchus pallidactylus

3a pinnately branched gallery, main and side branches on top of the midrib and side veins: Liriomyza strigata

3b blotch, or little, not pinnately, branched gallery; mine not determined by the leaf venation => 4

4a larva a maggot; mine partly or entirely upper- or lower-surface =>5

4b larva with chitinised head; mine full depth => 8

5a gallery from start to end => 6

5b blotch, may begin with a gallery => 7

6a pupation within the mine, in a, generally lower-surface, pupal chamber; frass in well-spaced grains: Chromatomyia horticola

6b pupation external; frass in strings: Liriomyza bryoniae

7a frass powdery, in dark green “clouds” in corners of the mine, often visibly only after the mine has been opened: Scaptomyza flava

7b frass in black strings: Liriomyza xanthocera

8a larva with prolegs; older larvae live free at the underside of the leaf: Plutella xylostella

8b no prolegs; larvae mine all their life => 9

9a larva with thoracic legs: Phyllotreta nemorum

9b larva without legs: Ceutorhynchus minutus

Tables for all parasites per species

mod 9.x.2017