Arabidopsis, thale cress, common wall cress

1a large parts of the mine upper- or lower-surface; larva a maggot => 2

1b mine full depth throughout; larva with chitinised head => 4

1c galls, etc. => 100

2a frass in green clouds (often visible only after the mine has been opened); mine in the end a blotch overlying the midrib: Scaptomyza flava

2b frass in black string or grains; corridor mine => 3

3a frass in strings; a branching corridor, overlying the midrib; pupation outside the mine: Liriomyza strigata

3b frass in isolated grains; corridor independent of the midrib; pupation within the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

4a mine < 1 cm; larva with thoracic feet and prolegs; the larvae soon leave the mine and start causing window feeding: Plutella xylostella

4b mine larger; larva, without prolegs, mines all its life => 5

5a larva without thoracic feet; mine more or less a corridor: Ceutorhynchus minutus

5b larva with thoracic feet; mine more a blotch: Phyllotreta nemorum

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

102 – Acari

102a Eriophyidae: >Aceria drabae

103 – Coleoptera

103a Curculionidae: Ceutorhynchus assimilis, atomus, chalibaeus, griseus, hirtulus

104 – Diptera

104a Cecidomyiidae: Contarinia nasturtii

105 – Hemiptera

105a Aphididae: Lipaphis rossi

107 – rust fungi

107a Pucciniaceae: Puccinia holboelli, thlaspeos

108 – smut fungi

108a Fungi, Glomosporiaceae: Thecaphora thlaspeos

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe cruciferarum

109b Peronosporaceae: Hyaloperonospora arabidopsidis, cardaminopsidis

110 – other causers

110a -andere veroorzakers

110a Bacteria, Actinomycetales: Rhodococcus fascians

110b Fungi, Albuginaceae: Albugo candida, laibachii

110c Fungi, Plasmodiophoraceae: Plasmodiophora brassicae