Chrysanthemum corn marigold, ox-eye daisy, marguerite
Incl. Dendranthema, Glebionis, Leucanthemum.
(For a dichotomous table for galls on Chrysanthemum by Hans Roskam click here)
Dichotomous table for leafminers
1a fleck mine => 2
1b corridor or blotch mine => 6
1c mine small, of indefinite shape; older larvae live free among spun leaves => 23
1d galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a fleck mine => 2
1b corridor or blotch mine => 6
1c mine small, of indefinite shape; older larvae live free among spun leaves => 23
1d galls, etc => Tables for all parasites per species
2a hole in the mine untidy, not neatly circular; case helicoidal: Apterona helicoidella
2b hole precisely circular; case more or less tubular => 3
3a tubular silken case; case yellowish or greyish => 4
3b sheath case; case black => 5
4a mouth angle c. 30°: C. folllicularis
4b mouth angle 45-60°: Coleophora trochilella
5a case with some diagonal ribs: Coleophora caelebipennella
5b case with some transverse ribs, behind the mouth: Coleophora rectilineella
6a mine full depth, transparant; larva with chitinised head => 7
6b mine upper- or lower-surface, opaque; larva a maggot => 11
7a mine begins as a corridor in the leaf base or midrib (after having moved to another location the mine is more blotch-like and not bound to a fixed position); larva without feet: Orthochaetes insignis and setiger
7b initial mine not associated with leaf basis or midrib; larva with thoracic feet => 8
8a inflated blotch with folds, not starting with a gallery: Scrobipalpa chrysanthemella
8b mine, at least in its beginning, a gallery => 9
9a on Leucanthemum pallens, alpine species: Bucculatrix alpina
9b on Leucanthemum vulgare, lowland species => 10
9b the mine of Bucculatrix latviaella is unknown, and its hostplant can only be guessed
10a corridor hair thin form start to end; older larvae live free and cause window feeding: Bucculatrix nigricomella
10b corridor widens considerably; lave mines all its life: Bucculatrix argentisignella
11a secondary feeding lines conspicuous; mine a blotch or a wide corridor => 12
11b no secondary feeding lines apparent => 14
12a elliptic lobed blotch on top of the midrib, with a central black spot (accumulation of frass): Trypeta artemisiae
12b broad gallery, centered over the midrib and lateral veins; frass dispersed, therefore no central black spot => 13
13a side branches of the mine widened towards the leaf margin: Cornutrypeta spinifrons
13b lateral branches distally not widened: Trypeta zoe
14a primary blotch, usually with several larvae; in greenhouses: Amauromyza maculosa
14b corridor, rarely a secondary blotch, with one larva; in greenhouses and outside => 15
15a pinnately branched corridor, positioned over the midrib and secondary veins: Liriomyza strigata
15b mine not pinnate, not associated with the leaf venation => 16
16a pupation in the mine; puparium in a usually lower-surface pupal chamber: Chromatomyia cf. syngenesiae (but see also Ch ciliata and paraciliata)
16b pupation only after the mine has been vacated => 17
17a frass in isolated grains => 18
17b frass in strings => 19
18a frass grains relatively large, widely separated: Phytomyza leucanthemi
18b frass grains small, close together: Phytomyza tanaceti
19a essentially on Achillea ansd Anthemis, but reported from Chrysanthemum coronarium: Liriomyza ptarmicae
19b mainly on greenhouse chrysanthemums* => 20
20a larva: rear spiraculum with 3 papillen => 21
20b larva: rear spiraculum with ≥ 6 papillae => 22
21a corridor densely coiled, almost a secondary blotch: Liriomyza trifolii
21b corridor runs loosely through the lamina: Liriomyza sativae
22a mine usually in the basal half of the leaf, often in contact with the midrib, often between two lateral veins: Liriomyza huidobrensis
22b mine without a preferred position, tresspassing over lateral veins; older parts of the mine often upper-surface: Liriomyza bryoniae
23a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana
23b pinacula black => 24
24a larva: behind/below the anus a chitinous comb: Cnephasia asseclana
24b anal comb absent: Cnephasia stephensiana
* For a definite identification of these four, often very noxious, species a study of the male genitalia, or biochemical techniques are necessary.
Not included in the key: Liriomyza dendranthemae.