Plant Parasites of Europe

leafminers, galls and fungi


Geum wood avens

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

Dichotomous table for leafminers

1a fleck mine; the larve mines from a transportable case => 2

1b small blotch mine, in the end with en excision of 2 mm: Incurvaria praelatella

1c blotch (without an excision), or a more or less widened gallery; no egg shell visible at the start of the gallery => 3

1d gallery (may be broadened further up), starting from a shining, semiglobular egg shell => 4

1e small, full depth, mines of indefinite shape; larvae grey; the older larvae live free between spun laeves => 7

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

2a case, seen from the side, paunchy, widest in the middle; the leaf fragments used to enlarge the case are mostly cut from the upper epidermis of the leaf: Coleophora violacea

2b case essentially tubular; the leaf fragments are cut from the lower epidermis: Coleophora potentillae

3a large full depth blotch; frass grains scattered irregularly; larva with chitinised head: Metallus lanceolatus

3b upper- or lower-surface corridor, quickly widening and/or forming a secondary blotch; frass at either side of the corridor; larva a maggot: Agromyza idaeiana

4a second half of the gallery strongly widenend => 5

4b gallery hardly widened towards the end => 6

5a egg usually at the upperside of the leaf; first quarter of the gallery not contorted, usually following a vein: Stigmella pretiosa

5b egg usually at the underside; first quarter of the gallery strongly contorted; mountain species: Stigmella geimontani

6a corridor long and slender, often crossing itself; frass line usually very narrow; larva: pronotum not spinulose: Stigmella splendidissimella

6b corridor shorter, broader, only rarely crossing itself; frass line usually broader; pronotum finely spinulose: Stigmella aurella

7a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

7b pinacula black: Cnephasia asseclana

Tables for all parasites per species

Last modified 21.iv.2020