Oenanthe, dropwort

fam. Apiaceae

1a mine < 1 cm, full depth, often in numbers together in a leaf axil; larvae, with distinct feet and chitinised head, later live free and cause extensive window feeding: Epermenia chaerophyllella

1b mine > 1 cm, not full depth; larva a maggot => 2

1c galls, etc => 100

2a large blotch with conspicuous primary and secondary feeding lines; larva: rear spiraculum with 3 papillae: Euleia heraclei

2b small blotch or corridor without apparent feeding lines; rear spiraculum with > 3 papillae => 3

3a frass in the lower-surface initial part of the mine sparse, often deliquescent; larva: rear spiraculum with 15-18 papillae: Phytomyza phellandrii

3b frass in this part of the mine as numerous black grains; rear spiraculum with > 30 papillae: Phytomyza oenanthica

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

103 – Coleoptera

103a Curculionidae: Lixus iridis

104 – Diptera

104a Cecidomyiidae: Kiefferia pericarpiicola; Lasioptera carophila

107 – rust fungi

107a Pucciniaceae: Uromyces lineolatus

108 – smut fungi

108a Entylomataceae: Entyloma helosciadii

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe heraclei

109b Peronosporaceae: Plasmopora nivea

110 – other causers

110a Fungi, Physodermataceae: Physoderma vagans

110b Fungi, Protomycetaceae: Protomyces macrosporus

110c Fungi, Synchytriaceae: Synchytrium aureum

Not included in the key:Depressaria daucella; Phytomyza chaerophylli.