Hirschfeldia hoary mustard
Dichotomous table for leafminers
1a whitish or mottled, irregular blotch overlying the midrib => 2
1b upper- or lower-surface corridor => 3
1c full depth corridor or blotch (not associated with the leaf venation) => 5
1d gallen etc => Tabellen voor alle parasieten per soort
2a frass powdery, in green “clouds”: Scaptomyza flava
2b frass in back grains or strings: Liriomyza xanthocera
3a pupation within the mine, in a, usually lower-surface, pupal chamber; frass in discrete granules: Chromatomyia horticola
3b pupation outside the mine; frass in strings => 4
4a mine pinnately branched, main branch overlying the midrib: Liriomyza strigata
4b mine not associated with the leaf venation: Liriomyza brassicae
5a miine small (< 1 cm), often irregular; frass in granules; larva, with prolegs, later lives free => 6
5b mijn > 1 cm, frass in strings or lumps; larva, without prolegs, remains in the mine all its life => 7
6a mine contains a little silk; free living larvae among spun leaves: Cnephasia incertana
6b mine contains no silk; free living larvae at the leaf underside: Plutella xylostella
7a frass in thread fragments; mine an untidy corridor; larva without thoracic feet: Ceutorhynchus minutus
7b frass in lumps; mine an irregular blotch; larva with thoracic feet: Phyllotreta nemorum
Not included in the key: Ceutorhynchus pallidactylus