Picris, ox-tongue

Incl. Helminthia, Helminthotheca.

1a mine full depth; larva with chitinised head: Orthochaetes setiger

1b mine upper- or lower-surface; larva a maggot => 2

1c galls, etc => 100

2a mine associated with the midrib => 3

2b mine independent of the midrib => 7

3a larva in the base of the midrib, that is galled and swollen: Phytomyza picridocecis

3b midrib not swollen => 4

4a mine pinnately branched; pupation after the mine has been vacated; frass in strings in the corridor and its side branches; larva: cephalic skeleton of the Phytomyzinae-type: Liriomyza strigata

4b larva lives in the midrib, from where it makes short exccursions into the lamina; these corridors almost free of frass, which is accumulated in the base of the hollow midrib; there also the puparium; larva: cephalic skeleton of the Agromyzinae-type => 5

5a larva: rear spiraculum with 8-9 papillae: Ophiomyia cunctata

5b larva: rear spiraculum with > 10 papillae => 6

6a larva: front spiraculum spine-like, erect: Ophiomyia pulicaria

6b llarva: front spiraculum broad, curved: Ophiomyia beckeri

7a puparium in the mine in a, usually lower-surface, pupal chamber; mine not unusually long: Chromatomyia cf. syngenesiae

7b pupation outside the mine; mine starting with an unusually long lower-surface corridor: Phytomyza marginella

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

102 – Acari

102a Eriophyidae: Aceria picridis

105 – Hemiptera

105a Asterolecaniidae: Planchonia arabidis

106 – Hymenoptera

106a Cynipidae: Phanacis caulicola, comosae; Timaspis helminthiae

107 – rust fungi

107a Coleosporiaceae: Coleosporium sonchi

107b Pucciniaceae: Puccinia picridis

108 – smut fungi

108a Entylomataceae: Entyloma picridis

109 – powdery and downy mildews

109a Erysiphaceae: Leveillula picridis; Neoërysiphe nevoi

109b Peronosporaceae: Bremia picridis

110 – other causers

110a Fungi, Albuginaceae: Pustula obtusata

110b Fungi, Protomycetaceae: Protomyces helminthiae, picridis

Not included in the key: Liriomyza bryoniae, sonchi, trifolii; Phytomyza cecidonomia; Trypeta immaculata.

16/11/2016