Fagus beech
(For a dichotomous table for galls on Fagus by Hans Roskam click here)
Dichotomous table for leafminers
1a blotch, in which eventually an excision is made => 2
1b large blotch, preceded by a corridor that begins on the midrib: Orchestes fagi
1c large blotch without a preceding corridor, containing a discoid cocoon (rare on this host plant): Tischeria decidua
1d tentiform mine => 4
1e small blotch without an excision or preceding corridor => 6
1f corridor => 8
1g elongated, silvery blotch overlying a vein; Phyllonorycter leucographella
1h fleck mine; larva mines from a transportable case: Coleophora currucipennella
1i small, full depth mines of variable, indefinite shape => 10
1j galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a blotch, in which eventually an excision is made => 2
1b large blotch, preceded by a corridor that begins on the midrib: Orchestes fagi
1c large blotch without a preceding corridor, containing a discoid cocoon (rare on this host plant): Tischeria decidua
1d tentiform mine => 4
1e small blotch without an excision or preceding corridor => 6
1f corridor => 8
1g elongated, silvery blotch overlying a vein; Phyllonorycter leucographella
1h fleck mine; larva mines from a transportable case: Coleophora currucipennella
1i small, full depth mines of variable, indefinite shape => 10
1j galls, etc => Tables for all parasites per species
2a the excision is hardly smaller than the mine => 3
2b the excision is much smaller than the mine: Incurvaria oehlmanniella
3a larva with on each thoracic segment a black dorsal plate: Incurvaria koerneriella
3b a black dorsal plate on the pronotum only; meso- and metanotum with only a small dark spot: Incurvaria masculella
4a mine small (< 9 mm), rectangular; lower epidermis brown: Parornix fagivora
4b mine larger, more oval or tubular; lower epidermis green => 5
5a mine oval, ca. 12 mm; cocoon in the mine incrusted with grains of frass; (uncommon): Phyllonorycter messaniella
5b mine more elongate, even tubular; frass in a corner of the mine, the cocoon, without frass, in the other corner; (very common): Phyllonorycter maestingella
6a mine lower-surface, usually not in a vein axil: Parornix fagivora
6b mine full depth, usually in a vein axil => 7
7a larvae in July-August: Caloptilia alchimiella
7b larvae in May, then again in August: Caloptilia robustella
8a corridor ≤ 1 cm; egg shell at start of the mine iridescent: Bucculatrix thoracella
8b corridor > 2 cm; egg shell shining => 9
9a frass coiled; mine usually begins at the leaf margin, winds downwards towards the midrib: Stigmella hemargyrella
9b frass not coiled; mine usually begins near the midrib and zigzags out in the direction of the leaf margin: Stigmella tityrella
10a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana
10b pinacula black: Cnephasia asseclana