Senecio groundsel, ragwort

Dichotomous table for leafminers

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 => 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

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.

mod 11.vii.2018