Arabis, rock-cress

Incl. Fourraea, Pseudoturritis, Turritis; Arabis holboellii => Boechera holboellii

1a mine full depth (except perhaps a green centre); larva with chitinised head => 2

1b mine upper- or lower-surface; larva a maggot => 6

1c galls, etc => 100

2a mine small, < 1 cm; larva, with prolegs and thoracic feet, later lives free => 3

2b mine > 1 cm; larve, never with prolegs, mines all its life => 4

3a mine contains frass; larva: pinacula white: Plutella xylostella

3b mine contains (almost) no frass; pinacula black: Cnephasia asseclana

4a blotch, with green centre; frass dispersed: Xenostrongylus lateralis

4b mine different => 5

5a frass partly in strings; larva without thoracic feet: Ceutorhynchus minutus

5b frass in lumps; mine an irregular blotch; larva with thoracic feet: Phyllotreta nemorum

6a frass in well-spaced grains: Chromatomyia horticola

6b frass in strings => 7

6c frass powdery, in blackish-green clouds (often visible only after the mine has been opened): Scaptomyza flava

7a broad coridor, overlying th midrib, with lateral extensions : Liriomyza xanthocera

7b corridor, not associated with the midrib, mostlly ending in a secondary blotch: Liriomyza bryoniae

100a Nematoda => 101

100b Acari => 102

100c Coleoptera => 103

100e Diptera => 104

100f Hemiptera => 105

100d Hymenoptera => 106

100g rust fungi => 107

100h smut fungi => 108

100i powdery and downy mildews => 109

100j other causers => 110

101 – Nematoda

101a Anguinidae: Ditylenchus dipsaci

101b Heeroderidae: , schachtii

102 – Acari

102a Eriophyidae: Aceria drabae

103 – Coleoptera

103a Curculionidae: Ceutorhynchus assimilis

104 – Diptera

104a Cecidomyiidae: Dasineura alpestris

105 – Hemiptera

105a Aphididae: Brevicoryne brassicae; Lipaphis erysimi, rossi, turritella

105b Asterolecaniidae: Planchonia arabidis

107 – rust fungi

107a Pucciniaceae: Puccinia paulii, thlaspeos, isiacae

108 – smut fungi

108a Fungi, Glomosporiaceae: Thecaphora thlaspeos

108b Urocystidaceae: Urocystis coralloides

110 – other causers

110a Fungi, Albuginaceae: Albugo candida

110b Fungi, Plasmodiophoraceae: Plasmodiophora brassicae