Fragaria strawberry
(For a dichotomous table for galls on Fragaria by Hans Roskam click here)
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, indefinite shape; the older larvae live free among spun leaves => 10
1e galls, etc => Tables for all parasites per species
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, indefinite 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 with 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.