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.
(For a dichotomous table for galls on Senecio by Hans Roskam click here)
Dichotomous table for leafminers
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 => Tables for all parasites per species
Dichotomous table for leafminers
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 => Tables for all parasites per species
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 long slender upper-surface gallery in Senecio ovatus, often partly following the midrib; frass in discrete grains: Phytomyza senecionis
8b otherwise => 9
9a short, relatively wide upper-surface gallery; frass in pearl chains or strings: Liriomyza erucifolii & L. latigenis
9b very long, inconspicuous lower-surface gallery, continued in a much shorter normal upper-surface one: Phytomyza marginella
Not included in the key: Agonopterix senecionis; Cnephasia lineata; Liriomyza samogitica, trifolii; Orthochaetes setiger; Phytomyza alpina; Phytosciara halterata, macrotricha; Trypeta immaculata.