Cucumis, cucumber

1a larva bores in the basis of the stem, making from there short excursions into the lower leaves: Delia platura

1b larva lives in the leaves only; mine a corridor => 2

1c galls, etc => 100

2a frass in isolated grains, lying more than their diameter apart; puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

2b frass mostly in strings or pearl chains; puparium formed outside the mine => 3

3a corridor pinnately branched, main branch overlying the midrib, side branches overlying the lateral veins; larva: rear spiraculum with 9-13 poapillae: Liriomyza strigata

3b corridor not pinnately branched, winding freely through the leaf; rear spiraculum with 7-9 papillae: 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 Meloidogynidae: Meloidogyne hapla

107 – rust fungi

107a Pucciniaceae: Puccinia isiacae

109 – powdery and downy mildews

109a Erysiphaceae: Golovinomyces cucurbitacearum, orontii; Leveillula taurica; Podosphaera xanthii

109b Peronosporaceae: Pseudoperonospora cubensis

110 – other causers

110a Bacteria, Actinomycetales: Rhodococcus fascians

110b Fungi, Capnodiales: Cladosporium cucumerinum

Not included in the key: Liriomyza huidobrensis, Liriomyza trifolii.