Plant Parasites of Europe

leafminers, galls and fungi


Arrhenatherum oat-grass

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

Dichotomous table for leafminers

1a mine full depth; larva with feet and chinitinised head; pupation outside the mine (Elachista) => 2

1b mine upper-surface; larva a maggot; pupation within or outside the mine => 3

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

2a of too many Elachista‘s the mines and larvae are badly known, and a key cannot be made. According to literature the following species occur on this host plant: Elachista albifrontella, apicipunctella, bedellella, canapennella, maculicerusella, nobilella, pullicomella, rufocinerea, subalbidella

3a larva: mandible with 1 tooth; rear spiraculum drawn into a slender point: Hydrellia griseola

3b mandible with 2 or more teeth; rear spiraculum not pointed (Agromyzidae) => 4

4a larve: cephalic skeleton of Agromyzinae-type; pupation outside the mine ** => 5

4b cephalic skeleton of Phytomyzinae-type; pupation within or outside the mine => 8

5a larva: behind the mandibles ventrally a field with spinulose warts; mandible with 2-3 teeth => 6

5b no such field; mandible with 4 teeth (only occasionally on this host plant): Agromya albipennis

6a larva: mandible with 3 teeth (the basal one clearly smaller than the apical two): Agromyza nigrociliata

6b mandible with 2 teeth => 7

7a larva solitary; rear end of blunt: Agromyza rondensis

7b larvae communal; rear end of cut off obliquely: Agromyza nigrella / A. mobilis

8a puparium in the mine => 9

8b pupation outside the mine => 11

9a puparium metallic black; spiracula not penetrating the epidermis: Cerodontha pygmaea

9b puparium orange-brown; front spiracula penetrating => 10

10a puparium monochromous; front spiracula somewhat bifid: Chromatomyia nigra

10b puparium with a ventral dark length band; front spiraculum fist-shaped: Chromatomyia fuscula

11a larva: rear spiraculum with 3 papillae: Liriomyza flaveola

11b rear spiraculum with 5-11 papillae => 12

12a larva: rear spiraculum with 5-7 papillae; October: Liriomyza pusio

12b rear spiraculum with 6-8 papillae; April-September: Liriomyza phryne

12c rear spiraculum with 9-11 papillae; May-September (occurrence on this plant not quite certain): Liriomyza graminivora

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

Not included in the key: Pseudonapomyza atra.

Tables for all parasites per species

Last modified 19.iv.2020