Knautia field scabious
(For a dichotomous table for galls on Kautia by Hans Roskam click here)Dichotomous table for leafminers
1a full depth corridor or blotch; larva with chitinised head => 2
1b mine upper- or lower-surface, greenish in transparency; larva a maggot => 5
1c galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a full depth corridor or blotch; larva with chitinised head => 2
1b mine upper- or lower-surface, greenish in transparency; larva a maggot => 5
1c galls, etc => Tables for all parasites per species
2a larva with prolegs and pinacula; grey; older larvae live free among spun leaves => 3
2b larva without prolegs or pinacula; yellow of green; the larva mines all its life => 4
3a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana
3b pinacula black: Cnephasia stephensiana
4a large transparant blotch; at the oviposition site a small shiny black drop of dried secretion: Trachys troglodytes (and ? T. subglaber)
4b corridor; no shiny black drop: cf. Apteropeda orbiculata
5a primary blotch at the leaf margin; feeding lines very conspicuous: Agromyza woerzi
5b corridor or secondary blotch; no feeding lines visible => 6
6a corridors radiation from the midrib, or pinnately branched and positioned over the midrib => 7
6b no association with the midrib => 9
7a corridors all arising from the the midrib: Chromatomyia ramosa
7b corridor pinnately branched and positioned over the midrib => 8
8a puparium in the mine: Chromatomyia scabiosarum
8b puparium outside the mine: Liriomyza strigata
9a frass almost absent, or a few large lumps near the end of the mine: Aulagromyza similis
9b frass in scattered grains => 10
10a leaf tissue around the mine intensively coloured violet; mine usually in the leaf tip: Chromatomyia succisae
10b leaf tissue not discoloured; no preferred position: Chromatomyia horticola
Palm (1989a) mentions field scabious as a host plant of Agonopterix arenella. Because all other known hosts of this species are Asteraceae this observation probably is incidental.
Not included in the key: Cnephasia incertana, stephensiana; Trachys troglodytes subglaber.