Sinapis mustard

Dichotomous table for leafminers

1a corridor, not widening into a blotch => 2

1b blotch; may be preceded by a corridor => 8

2a corridor ends upon a thick vein; from there the larva continues as a borer => 3

2b corridor not ending upon a vein => 4

3b larva with chitinised head: Ceutorhynchus pallidactylus

4a corridor pinnately branched, main branch overlying the midrib: Liriomyza strigata

4b corridor not pinnate, not associated with the midrib => 5

5a mine full depth; larva with chitinised head => 6

5b mine upper- or lower-surface; larva a maggot => 7

6a mine < 1 cm; larva, with thoracic feet, later lives free: Plutella xylostella

6b mine > 1 cm; larva, without thoracic feet, remains in the mine until close to pupation: Ceutorhynchus minutus

7a frass in discrete grains; puparium in the mine in a, usually lower-surface, pupal chamber: Chromatomyia horticola

7b frass, at least partly, in strings; pupation outside the mine: Liriomyza bryoniae

8a a blotch overlying the midrib, initially elliptic, later widening => 9

8b no association with the midrib => 10

9a frass powdery, in blackish-green clouds: Scaptomyza flava

9b frass partly in black strings: Liriomyza xanthocera

10a mine < 1 cm; larva with thoracic and abdominal feet, lives later free: Plutella xylostella

10b mine > 1 cm; larva with thoracic feet only, remains in the mine until close to pupation: Phyllotreta nemorum

Not included in the key: Aulagromyza mamonowi.