Betula birch
(For a dichotomous table for galls on Betula by Hans Roskam click here)
Dichotomous table for leafminers
1a mine ends in a round or oval excision => 2
1b blotch without a preceding corridor (or this corridor < 3 mm) => 6
1c blotch preceded by a corridor => 23
1d corridor from start to end => 30
1e short corridor that widens so fast and strongly that it could as well be called a triangular blotch; elliptic larva always present: Rhamphus pulicarius
1f tentiform mine => 41
1g fleck mine => 49
1h galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a mine ends in a round or oval excision => 2
1b blotch without a preceding corridor (or this corridor < 3 mm) => 6
1c blotch preceded by a corridor => 23
1d corridor from start to end => 30
1e short corridor that widens so fast and strongly that it could as well be called a triangular blotch; elliptic larva always present: Rhamphus pulicarius
1f tentiform mine => 41
1g fleck mine => 49
1h galls, etc => Tables for all parasites per species
2a excision initially a blotch, without preceding corridor, or corridor < 5 mm => 3
2b excision preceded by a narrow or wide corridor >> 5 mm (may be inside a vein) => 4
3a excision elliptic, ca. 3 x 5 mm: first stage mines of Coleophora species
3b excision circular, ca. 5 mm in diameter, often several in a leaf: Incurvaria pectinea
4a main part of the mine within the midrib and/or a thick vein; from there a short yellow-green corridor enters the leaf disk, followed by an oval excision: Heliozela hammoniella
4b mine not associated with midrib of thick veins => 5
5a corridor gradually widening, excision almost circular: Orchestes rusci
5b corridor very long, thread-thin, suddenly widening into an oval excision: Phylloporia bistrigella
6a at the start of the mine, on the leaf margin, a shining black drop of dried secretion: Trachys minutus
6b no such drop => 7
7a frass in threads of one or more cm long => 8
7b frass in grains, sometimes short thread fragments => 12
8a mine in the centre of the leaf => 25
8b mine at the leaf margin => 9
9a larvae usually communal; very transparant, almost hyaline: Eriocrania cicatricella
9b larva solitary; grey or white => 10
10a full grown larva slate grey; vacated mines still recognisable by the presence of a gray larval skin: Eriocrania sangii
10b larva milk white at all stages => 11
11a rear corners of the head capsule elongate and strongly sclerotised, black; because the head is retracted witihin the prothorax it appears as two vague black spots: Heringocrania unimaculella
11b prothorax without “black spots”: Eriocrania semipurpurella
12a blotch round, with a dark centre => 13
12b blotch round or not, never with a dark centre => 14
13a frass in clear arcs around the dark centre: Leucoptera malifoliella
13b outside the centre only little frass, not in arcs: Ectoedemia occultella
14a mine full depth, ≤ 2 mm, with a few grains of frass, with a hole through which the mine has been vacated: Swammerdamia caesiella
14b mine not like this => 15
15a larva squat, without feet (larva of Curculionidae) => 16
15b larva slender, with thoracic feet => 17
16a blotch comma- or pear-shaped, often several in a leaf; mine contains much frass, making it dark and inconspicuous; no cocoon: Rhamphus pulicarius
16b mine larger, more transparent, solitary; larva eventually makes a globular cocoon in the mine: Orchestes jota
17a larva bright pink, marbled; under the leaf a loose spinning is present, in which grains of ejected frass are caught: Atemelia torquatella
17b larva pale yellow (except for some eventual dark brown spots); sawfly larva => 18
18a mine begins in the centre of the leaf => 19
18b mine begins at the margin => 20
(The oldest part of the mine usually is less deep, therefore greener in transparency, than later parts. The frass here in smaller grains. Often an oviposition scar is recognisable as a bright green flat wart at the leaf upper surface.)
19a larva: thoracic feet well developed; usally sveral mines, of different sizes, in a leaf: Fenusa pumila
19b thoracic feet reduced to stumps; mine usually solitary: Profenusa thomsoni
20a mine begins with a triangular section (one angle at the very leaf margin), crammed with frass; from there an, often quite large, blotch develops: Fenusella nana
20b mine a broad blotch from the beginning, without such an initial accumulation of frass => 21
21a oldest part of the mine, near the leaf margin, dark reddish brown; mine contains little frass; larva eventually makes a flat circular cocoon: Heterarthrus nemoratus
21b mine pale brown throughout, containing much frass; never a cocoon => Scolioneura betuleti
23a frass in long threads => 24
23b frass in grains or flakes => 25
24a initial corridor gradually widening into a blotch; larvae in mid May: Eriocrania salopiella
24b initial corridor suddenly, often under an angle, widening into a blotch; larvae in mid June: Eriocrania sparrmannella
25a mine begin in or on the midrib => 26
25b mine begins elsewhere => 27
26a oviposition, at the underside of the midrib, leaves a big, deep, scar; from there a corridor starts that widens strongly close to the leaf tip; apical part of the leaf often crumpled: Orchestes calceatus
26b no strong scar; leaf tip never crumpled: Tachyerges pseudostigma & T. stigma
27a mine starts at an ( lower-surface, globular, shining) egg shell; from there a strongly tortuous gallery, that widens into a blotch: Ectoedemia minimella
27b no egg shell visible; initial corridor not strongly contorted => 28
28a initial corridor long and very slender: Lyonetia prunifoliella
28b initial corridor broad and short, often overrun by the later blotch => 29
29a larva slender with (short) thoracic feet; leaves the mine prior to pupation: Profenusa thomsoni
29b larva squat, without feet; pupates in the mine in a globular cocoon: Orchestes jota
30a small corridor, often branched, without frass: Recurvaria nanella
30b mine unbranched, containing frass => 31
31a mine shorter than 1 cm: Bucculatrix demaryella, in Central Europe also Bucculatrix thoracella
31b mine much longer => 32
32a mine upper-surface, greenish: Agromyza alnibetulae
32b mine full depth, whitish => 33
33a mine begins at an egg shell, that is globular and shining, and may be upper- or lower-surface; mine never starts in the midrib (Stigmella-species) => 34
33b no egg shell at the beginning of the corridor => 40
34a in most of the length of the corridor the frass is coiled => 35
34b frass nowhere coiled => 36
35a frass (in fresh mines) green, the coils filling the width of the corridor; initial part of the corridor contorted, making the leaf tissue turn brown: Stigmella continuella
35b frass black, even in fresh mines, never filling the width of the corridor; mine usually starting near the leaf margin; initial stretch not strongly contorted, not discolouring the leaf tissue: Stigmella sakhalinella
36a corridor long and angular; frass line in the second half of the mine very narrow => 37
36b corridor shorter, more tortuous; frass line in the second half wider, often interrupted => 38
37a first part of the corridor completely filled with green (turning brown) frass: Stigmella lapponica
37b also in the first part of the corridor the frass in a narrow median line: Stigmella confusella, and, thermophilic species from Central Europe, Stigmella naturnella
38a mine in Lapland, on Betula nana: Stigmella tristis
38b mine in more temperate regions, also on other Birch species => 39
39a initial part of the corridor lower-surface, green in transparency; usually 1 mine per leaf; August-November: Stigmella luteella**
39b corridor full depth from the start on, transparent; often > 1 mines per leaf; June-October: Stigmella betulicola**
40a oviposition in the midrib (usually in its apical part) causing it to gall and swell; early spring: Anoplus plantaris
40b oviposition never in the midrib; mines throughout the summer: Lyonetia clerkella
41a mine upper-surface => 42
41b mine lower-surface => 44
42a mine silvery; pupation in the mine: Phyllonorycter corylifoliella
42b mine brownish; larva leaves the mine early and continues living in a rolled part of the leaf; several rolls are made and eaten out => 43
43a pupa: pronotum with a pair of elongated ridges: Caloptilia populetorum
43b pronotum with a pair of shallow depressions: Caloptilia betulicola
43c the pupa C. suberinella is undescribed.
44a mined cuticula brownish; larva leaves the mine early and continues living in a folded or rolled part of the leaf; several rolls are made and eaten out => 45
44b mined cuticula (pale) green; pupation in the mine => 47
45a free living larva in a folded leaf margin => 46
45b free living larva in a rolled leaf => 43
45c free living larva in a leaf that has been folded up downwards; only on Betula nana: Parornix polygrammella
46a mine randomly positioned, preceded by a short corridor: Parornix betulae and, in northern Europe, Parornix loganella
46b mine at the leaf margin, preceded by a long corridor that often follows the midrib for some distance, before turning towards the leaf margin (rare on Birch): Caloptilia stigmatella
47a mine 15-20 mm; lower epidermis with 7-12 folds: Phyllonorycter cavella
47b mine 10-15 mm; lower epidermis with 1-6 folds => 48
48a pupa not in a cocoon; almost exclusively on seedlings: Phyllonorycter anderidae
48b pupa in a coccon (may consist of no more than a loose spinning); not restricted to seedlings: Phyllonorycter ulmifoliella
49a case helicoidal: Apterona helicoidella
49b case tubular => 50
50a lobe case => 51
50b composite leaf case => 54
50c tubular leaf case => 56
50d spatulate leaf case => 57
50e pistol case, with a pallium => 58
51a case plump, rear end strongly curved downwards => 52
51b case slender, rear end almost straight => 53
52a case funnel-shaped; rear end strongly narrowed: Coleophora cornutella
52b case pistol-shaped, rear end not strongly narrowed: Coleophora fuscocuprella
53a case brownish black; mouth angle 0°: Coleophora violacea
53b case whitish; mouth angle 10°-30°: Coleophora potentillae
54a extensions of the case made out of bits of epidermis => 55
54b extension made out of narrow rings; case strongly curved; September-May: Coleophora serratella (juvenile case)
55a connection between the consecutive parts of the case “seamless”; in spring and early summer case unicolorous; August-October: Coleophora orbitella
55b connection between the parts untidy, frayed; in spring and early summer these parts with different colours; August-June: Coleophora binderella
56a case flattened tubular, with a narrow dorsal keel, smooth, April-June: Coleophora serratella (final case)
56b case zeppelin-shaped with intidy leaf fragments attached to it, August-July: Coleophora siccifolia
57a full grown case 8-11 mm; mouth angle 45°: Coleophora milvipennis
57b case 13 mm; mouth angle 15° (occurence on Birch, at least in western Europe, dubious): Coleophora alnifoliae
58a mouth angle 70-80°; case somewhat shiny; : Coleophora anatipenella
58b mouth angle 30-45°; case mostly rough and dull: Coleophora betulella
** A mine of St. glutinosae has recently been found by van Nieukerken on birch.
Not included in the key: Caenorhinus mannerheimii, Coleophora currucipennella, prunifoliae, vacciniella; Ectoedemia subbimaculella; Parornix traugotti; Roeslerstammia erxlebella; Stigmella alnetella; Swammerdamia passerella.