Poa meadow-grass

Dichotomous table for leafminers

Incl. Ochlopoa annua.

1a fleck mine: Coleophora lixella

1b corridor or blotch => 2

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

2a larva with feet and chitinised head => 3

2b larva a maggot => 5

3a larva with prolegs; rar margin of head convex => 4

3b larva without abdominal feet; rear margin of head deeply excised: Hispa atra

5a at the start of the mine (often within a leaf sheath) at the outside an egg shell; larva: mandible with 1 tooth: Hydrellia griseola

5b no egg shell visible; mandible with 2 or more teeth => 6

6a larva: cephalic skeleton of Agromyzinae-type; pupation usually outside the mine => 7 *

6b cephalic skeleton of Phytomyzinae-type; pupation within or outside the mine => 10

7a larva: rear spiracula almost touching each other: Agromyza albipennis

7b rear spiracula at least 2x their diameter apart => 8

8a larva: rear end of cut off obliquely; larvae usually communal; mine greenish => 9

8b rear end of cut off at right angle; larva solitary; mine whitish: Agromyza rondensis

9a larvae in July (1 generations): Agromyza nigrella

9b larvae in June and August (2 generations): Agromyza mobilis

10a pupation outside the mine => 11

10b puparium witihn the mine => 13

11a larva and puparium set with transverse row of long spinelike papillae: Pseudonapomyza atra

11b no such spines => 12

12a larva: rear spiraculum with 3 papillae: Liriomyza flaveola

12b rear spiraculum with 6 papillae: Liriomyza graminivora

12c rear spiraculum with > 10 papillae: Cerodontha flavocingulata

13a puparium: either front or rear spiracula penetrate the epidermis => 14

13b puparium not connected with the outside world (Cerodontha) => 17 **

14a puparium: rear spiracula strongly elongated, fang-shaped, anchoring the puparium into the leaf tissue: Chromatomyia milii

14b rear spiracula normal => 15

15a puparium shining black; rear spiracula penetrate: Cerodontha muscina

15b puparium lighter coloured; front spiracula penetrate => 16

16a puparium monochromous orange brown; front spiracula indistinctly bifid: Chromatomyia nigra

16b puparium yellow to orange brown with a darker ventral length line; front spiracula fist-shaped: Chromatomyia fuscula

17a larva: rear spiraculum with 11-16 papillae; puparium in the leaf sheath: Cerodontha fulvipes, C. denticornis & C. atronitens

17b rear spiraculum with 6 papillae at most; puparium in the blade, fastened in the mine with strands of silk => 18

18a larva: the black warts at the outside of the rear spiracula small, without a “root”: Cerodontha incisa

18b these warts large, with a deep dark “root”: Cerodontha pygmaea

* See also the key to grass-inhabiting Agromyza larvae.

** Cerodontha fasciata has been reared from Poa, but the larvae are not described.

Not included in the key: Cerodontha alpina, chaixiana, crassiseta, melicae, rohdendorfi, superciliosa; Coleophora ornatipennella; Liriomyza orbona; Ochsenheimeria taurella, vaccuella.

mod 9.x.2017