Thlaspi, penny-cress

Dichotomous table for leafminers

Incl. Microthlaspi, Noccaea.

1a fleck mine; larva mines from a helicoidal case: Apterona helicoidella

1b no fleck mine; larva mines from the inside => 2

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

2a larva with well recognisable head; mine full depth => 3

2b larva a maggot; mine largely or entirely upper- or lower-surface => 8

3a larva with thoracic feet => 4

3b larva without feet => 7

4a larva with prolegs; older larvae live free => 5

4b larva, with prolegs, mines all its life: Phyllotreta nemorum

5a free living larvae among spun leaves => 6

5b free living larvae at the underside of the leaf, where they cause window feeding: Plutella xylostella

6a larva: pinacula colourless (the bases of the setae themselves are black): Cnephasia incertana

6b pinacula black: Cnephasia stephensiana

7a mine begins at a gall in the petiole: Ceutorhynchus chalibaeus

7b no gall in the petiole: Ceutorhynchus minutus

8a frass powdery, in green clouds in remote corners of the mine: Scaptomyza flava

8b frass in black grains or strings => 9

9a pupation in the mine, in a, generally lower-surface, pupal chamber: Chromatomyia horticola

9b pupation external => 10

10a pinnately branched corridor, main and side branches on top of midrib and major side veins; corridor nowhere strongly widened: Liriomyza strigata

10b corridor not pinnate, widened in the end to form an elongate blotch on top of the midrib: Liriomyza xanthocera

Not included in the key: Liriomyza trifolii.

mod 9.x.2017