Senecio, groundsel, ragwort

Incl Jacobaea; Kleinia and Pericallis (incl. Cineraria), that often are included in Senecio, are treated separately here. See also the related genera Packera en Tephroseris.

1a full depth corridor (sometimes quite wide), often beginning at the leaf base or midrib, never seemingly ending upon the midrib; larva with chitinised head: Orthochaetes insignis

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

1c galls, etc => 100

2a secondary feeding lines conspicuous in the widest parts of the mine => 3

2b no secondary feeding lines apparent => 6

3a mine begins with a long, hair-thin corridor that transverses the leaf, cutting off the distal part that is killed; here the mine continues into a large blotch: Stemonocera cornuta

3b blotch or wide corridor, clearly associated with the midrib; a narrow initial corridor, if at all visible, never cutting off part of the leaf => 4

4a oval lobed blotch with a dark centre (frass concentration): Trypeta artemisiae

4b mine with different shape, no darkened centre => 5

5a mine more or less a corridor: Trypeta zoe

5b mine consists of several connected blotches: Cornutrypeta spinifrons

6a mine a pinnately branched corridor, its main branch positioned over the midrib: Liriomyza strigata

6b mine a corridor, but not pinnately branched, not associated with the midrib => 7

7a puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

7b larva leaves the mine prior to pupation through a semicircular exit slit => 8

8a short, relatively wide corridor in Senecio erucifolius or jacobaea; frass in pearl chains or strings: Liriomyza erucifolii

8øb long slender upper-surface corridor in Senecio ovatus; frass in discrete grains: Phytomyza senecionis

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 leioprocta

105 – Hemiptera

105a Aphididae: Allocotaphis quaestionis; Aphis jacobaeae; Eriosoma patchiae

105b Triozidae: Trioza senecionis

109 – powdery and downy mildews

109a Erysiphaceae: Golovinomyces fischeri, senecionis; Leveillula taurica; Podosphaera senecionis

109b Peronosporaceae: Bremia tulasnei

110 – other causers

110a Fungi, Albuginaceae: Pustula obtusata

110b Fungi, Synchytriaceae: Synchytrium aureum, globosum

110c Lepidoptera, Pterophoridae: Platyptilia isodactylus, nemoralis

110d Lepidoptera, Pyralidae: Phycitodes maritima

110e Lepidoptera, Tortricidae: Cochylis atricapitana; Epiblema scutulana

110f ? on Jacobaea vulgaris

Not included in the key: Agonopterix senecionis; Cnephasia lineata; Liriomyza samogitica, trifolii; Orthochaetes setiger; Phytomyza alpina; Phytosciara halterata, macrotricha; Trypeta immaculata.