Lathyrus vetchling

Dichotomous table for leafminers

In the wings of the stem and petioles mines can be found of Agromyza lathyri, A. varicornis and Liriomyza pisivora.

1a fleck mine: Coleophora coronillae (occurrence on Lathyrus uncertain)

1b blotch, tentiform or gallery mine => 2

2a larva with thoracic feet and chitinised head; blotch or tentiform mine => 3

2b larva a maggot; mine a gallery, or a gallery followed by a blotch => 15

1c galls, etc => Tables for all parasites per species

3a pupation within the mine; tentiform mine => 4

3b pupation outside the mine; mine generally flat, not folded => 6

4a mine strongly inflated, leaflet almost entirely folded around the mine; upper surface of the mine mottled white; pupa: cremaster seemingly with one pair of strong spines (unknown for trifoliella) => 5

4b mine weakly inflated; upper surface of mine essentially green; cremaster with two pairs of extremely slender spines: Phyllonoryter insignitella

5a the cocoon consists of a lining of the walls of the mine: Phyllonorycter nigrescentella

5b the cocoon consists of a thin film under and above the pupa: Phyllonorycter trifoliella

6a mine inflated, its epidermis often torn: Sauterina hofmanniella

6b mine flat, epidermis entire => 7

7a mine smal; older larve lives free among spun leaves => 8

7b mine not unusually small; larva mines all its life => 12

8a mine contains almost no frass; larva: prothoracic shield largely dull black => 9

8b mine contains clear amounts of frass => 11

8c also Ancylis badiana is reported to make similar mines; the description is not sufficiently detailed

9a larva: pinacula colourless (however, the base of the setae is black): Cnephasia incertana

9b pinacula black => 10

10a larva: below/behind the anus a black chitinous comb: Cnephasia asseclana

10b anal comb absent: Cnephasia stephensiana

11a larva: uniformly purplish brown to dark greyish brown: Aproaerema anthyllidella

11b pale, reddish, conspicuously marked: Syncopacma karvoneni

12a mine contains little or no frass: Micrurapteryx gradatella

12b mine with normal quantities of frass => 13

13a in the mine, over the midrib, a lair of silk: Cosmopterix schmidiella

13b no silk in the mine => 14

14 on Lathyrus species bearing tendrils: Leucoptera lathyrifoliella

14b on species without tendrils: Leucoptera orobi

15a gallery widens into a large blotch => 16

15b a gallery till the end => 21

16a eventual blotch with large or small full depth patches => 17

16b no full depth patches present => 19

17a mine begins with a clear lower-surface gallery; larva: cephalic skeleton of Agromyzinae type => 18

17b lower-surface beginning extremely small; cephalic skeleton of Phytomyzinae type: Amauromyza chamaebalani

18a blotch largely full depth, with coarse frass grains; larva: rear spiraculum with ca. 40 papillae: Agromyza lathyri

18b blotch with only a few full depth spots, hardly any frass; rear spiraculum with 3 papillae: Agromyza varicornis

19a gallery part free from the leaf margin; blotch upon the midrib, with side branches; frass, at least partly, in thread fragments: Liriomyza xanthocera

19b gallery part follows the leaf margin; blotch free in the lamina, without extensions; frass in grains => 20

20a larva: cephalic skeleton Agromyzinae-type: Agromyza orobi

20b cephalic skeleton Phytomyzinae-type: Phytoliriomyza variegata

21a puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

21b puparium outside the mine => 22

22a pinnately branched gallery, its main branch overlying the midrib: Liriomyza strigata

22b mine not pinnately branched, not associated with the midrib => 23

23a gallery upper-surface; frass in a broad green central band; larva: rear spiraculum with 3 papillae: Liriomyza congesta

23b gallery generally begins at lower surface; frass not in a green band => 24

24a generally in greenhouses; larva: rear spiraculum with 3 papillae: Liriomyza trifolii

24b generally in open air; rear spiraculum with ≥ 4 papillae => 25

25a mine a gallery; frass in unusually long threads; larva: rear spiraculum with 4-8 papillae: Liriomyza pisivora

25b mine often ending in a secondarly blotch; frass in strings; rear spiraculum with 7-12 papillae: Liriomyza bryoniae

mod 9.x.2017