Fragaria strawberry

Dichotomous table for leafminers

1a tiny blotch, eventually with an excision of about 2 mm: Incurvaria praelatella

1b blotch, without an excision; if there is a preceding corridor this is wide and not longer than the blotch => 2

1c corridor often strongly widened towards the end => 3

1d fleck mine => 8

1d small, full depth mines of variable, undefinite shape; the older larvae live free among spun leaves => 10

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

2a oviposition spot covered by a shining black drop of dried secretion: Trachys fragariae

2b no such drop: Fenella nigrita

3a mine begins at a shining globular egg shell; in the corridor the frass in a central line; larva with chitinised head => 4

3b no egg shell at the start of the mine; frass in two rows along the sides of the corridor; larva a maggot => 7

4a last section of the mine widened into a blotch => 5

4b a corridor from start to end => 6

5a first part of the corridor strongly contorted, inteestine-like: Ectoedemia arcuatella

5b entire corridor in wide loops: Stigmella aeneofaciella

6a corridor long, often crossing itself; frass line very narrow; no living larvae in the period December-April: Stigmella splendidissimella

6b mine not that long, only rarely crossing itself; living larvae also in December-April: Stigmella aurella; possibly also Stigmella thuringiaca

7a in the corridor part the frass lies in two rows of grains; larva: rear spiraculum mwith 3 papillae: Agromyza idaeiana

7b frass almost filling the corridor; rear spiraculum with 6 papillae: Agromyza sulfuriceps

8a lobe case => 9

8b spatulate leaf case: Coleophora albicostella, gryphipennella

8c sheath case, Coleophora flavipennella en lutipennella (xenophagy?)

9a case brown; lobes are cut from the upper epidermis; mouth angle 0°-10°: Coleophora violacea

9b case whitish; lobes are cut from the lower epidermis; mouth angle 20°-30°: Coleophora potentillae

10a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

10b pinacula black => 11

11a larva: behind/below the anus a chitinous comb: Cnephasia asseclana

11b anal comb absent: Cnephasia stephensiana

Not included in the key: Parornix anglicella; Tinagma perdicella.

mod 9.x.2017