Plant Parasites of Europe

leafminers, galls and fungi


Acer maple

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

Dichotomous table for leafminers

1a corridor mine => 2

1b blotch or tentiform mine, not ending in an excision => 6

1c small blotch, from which eventually an excision is made of almost equal size => 25

1d fleck mine; larva mines from a transportable case: Coleophora badiipennella

1e small, full depth mines of indefinite shape => 26

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

2a corridor shallow (often iridescent, epidermal): very young mines of Phyllonorycter ( => 7) or Caloptilia/Parornix ( => 11)

2b corridor (almost completely) full depth => 3

3a corridor ≤ 1 cm, in a vein axil; egg shell at start of mine iridescent => 4

3b corridor ≤ 1 cm, near the margin of the leaf: Roeslerstammia erxlebella

3c corridor > 2 cm; egg shell shining => 5

4a lowland species: Bucculatrix thoracella

4b mountain species, Alps: Bucculatrix demaryella

5a on Acer campestre and platanoides: Stigmella aceris

5b on Acer pseudoplatanus: Stigmella speciosa

6a inflated tentiform mine => 7

6b flat blotch mine => 10

7a on Acer campestre, NW Europe: Phyllonorycter acerifoliella

7b on Acer campestre, elsewhere => 8

7c on Acer monspessulanum => 9

7d on Acer platanoides: Phyllonorycter joannisi

7e on Acer pseudoplatanus: Phyllonorycter geniculella

7f on Acer obtusifolium, sempervirens: Phyllonorycter obtusifoliella

8a pupa: at either side of the anus a sharp tubercle: Phyllonorycter acerifoliella

8b no such tubercle: Phyllonorycter monspessulanella

9a male pupa: front wing roughly sculptured; female pupa: metanotum with a pair of pits near the caudal margin: Phyllonorycter fiumella

9b male pupa: front wing smooth; female pupa: metanotum without a pair of pits: Phyllonorycter monspessulanella

10a mine < 1 cm, mostly in a vein axil; larva greenish or whitish; older larvae free-living in a down-folded leaf segment or leaf roll => 11

10b mine much larger, larvae not that pale => 16

11a larva: pronotum with 2+2 black spots; older larvae in a downfolded leaf margin: Parornix carpinella

11b larva: pronotum white; older larvae almost always in a leaf roll => 12

12a pupa: pronotum with a transverse ridge, bearing several sharp spines; spinulation of abd5 anteriorly much coarser than posteriorly; mostly on Acer pseudoplatanus: Caloptilia rufipennella

12b ridge without, or with only blunt, spines; spinulation of abd5 homogenous; mainly on Acer campestre => 13

13a pupa: pronotum with e median depression; larva greyish yellow: Caloptilia fribergensis

13b no median depression => 14

14a pupa: pronotum with short transverse ridge, more laterally a shallow depression: Caloptilia hemidactylella

14b pupa unknown => 15

15a larva yellow (reliable?); on Acer campestre, pseudoplatanus: Caloptilia hauderi

15b larva pale green; problably only on Acer campestre: Caloptilia semifascia

15c problably only on Acer platanoides: Caloptilia jurateae

16a oviposition site, mostly at the tip of a leaf lobe, covered by a shining black drop of hardened secretion: Trachys minutus

16b no such drop => 17

17a frass coarsely granular; mine transparent => 18

17b centre of the mine darkened by an accumulation of tar-like frass on the floor; mine brownish: Cameraria ohridella

18a larva: feet slender, colourless; pupation outside the mine => 19

18b feet short, triangular, generally darkly coloured; pupation in a disk-shaped cocoon within the mine => 22

19a mine upper-surface, greenish; a shining egg shell at the start of the mine => 20

19b mine full depth, transparent; no egg shell visible; spring => 21

20a mine small; frass in a central spot; summer: Leucoptera aceris

20b mine large; frass dispersed; autumn: Leucoptera nieukerkeni

21a head dorsally with dark markings; on Acer campestre: Hinatara nigripes

21b head similar, on other Acer species: Hinatara excisa

21c head pale, dorsally without markings: Hinatara recta

22a the cocoon falls out of the mine, leaving a circular excision in the upper epidermis => 23

22b the cocoon is not excised, falling finally along with the leaf: Heterarthrus leucomela

23a on Acer campestre: Heterarthus wuestneii

23b on Acer platanoides: Heterarthrus flavicollis

23c on Acer obtusifolium: Heterarthrus cypricus

23d on Acer sempervirens: Heterarthrus imbrosensis

23e on Acer pseudoplatanus => 24

24a mine begins at the tip of a leaf lobe: Heterarthrus fiora

24b mine begins in the centre of the leaf: Heterarthrus cuneifrons

25a larva with yellow-brown head; May-June: Incurvaria pectinea

25b larva with black head; July-August: Incurvaria oehlmanniella

25c mining stage unknown; central, southern Europe: Paraclemensia cyanella, Vespina slovaciella

26a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

26b pinacula black: Cnephasia asseclana

Not included in the key: Caloptilia honoratella.

In the wings of the fruits (samaras) short corridors may be found, made by Ectoedemia-species (Nepticulidae). On Acer campestre lives Etainia louisella , on A. platanoides Etainia sericopeza, and on A. pseudoplatanus Etainia decentella.

Tables for all parasites per species

Last modified 7.xii.2020