Plant Parasites of Europe

leafminers, galls and fungi


Agrostis bent-grass

(For a dichotomous table for galls on Agrostis by Hans Roskam click here)

Dichotomous table for leafminers

1a larva with chitinised head; in the narrower parts of the corridor the frass in a more or less narrow central line => 2

1b larva a maggot; in narrower corridors frass in two rows along the sides => 3

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

2a a number of Elachistidae; the larvae of many species are too unsufficiently known to build a key. The following species have been recorded in literature from Agrostis: Elachista albifrontella, apicipunctella, argentella, bifasciella, canapennella, freyerella, herrichii, humilis, maculicerusella, nobilella, stabilella

3a larva: mandible with 1 tooth; at the start of the mine (often in a leaf sheath) at the outside an egg shell: Hydrellia griseola

3b mandible with 2 or more teeth; no egg shell visible => 4

4a larva: cephalic skeleton of Agromyzinae-type (rare on this host plant) * => 5

4b cephalic skeleton of Phytomyzinae-type => 6

5a rear spiracula touch each other; puparium either in, or outside the mine: Agromyza albipennis

5b rear spiracula separated by at least their diameter; puparium outside the mine: Agromyza nigripes

6a pupation within the mine => 7

6b pupation outside the mine => 11

7a puparium: front spiracula penetrate the epidermis => 8

7b puparium not in contact with the outside world => 9

8a larva and puparium: rear spiraculum long, fang-shaped: Chromatomyia milii

8b rear spiraculum compact, fist-shaped: Chromatomyia nigraa

9a puparium black with a metallic shine, anchored in the mine by a thread of silk => 10

9b puparium brown, not anchored: Cerodontha beigerae

10a larva: the black warts at the outside of the rear spiracula small, without a “root”: Cerodontha incisa

10b these warts large, with a deep “root”: Cerodontha pygmaea

11a larva bright yellow => 12

11b larva white to amber => 13

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

12b rear spiraculum with ca. 6 papillae (occurence on this host not certain): Liriomyza pusio

12c rear spiraculum with 12 or more papillae: Cerodontha flavocingulata

13a larva and puparium: on each segment a transverse row of spines, about as long as the width of the segment: Pseudonapomyza atra

13b zonder zulke stekels: Cerodontha atra

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

Tables for all parasites per species

Last modified 6.iii.2020