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(Coleoptera, Diptera, Hymenoptera and Lepidoptera)
by
Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds
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CAMPANULA.
Bellflowers and Harebells. [Campanulaceae]
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Twenty
species of Campanula are recorded in Britain. These include
the native species Clustered Bellflower (C. glomerata), Giant
Bellflower (C. latifolia), Spreading Bellflower (C. patula),
Harebell (C. rotundifolia) and Nettle-leaved Bellflower (C.
trachelium) and the introduced Canterbury-bells (C. medium),
Cornish Bellflower (C. alliariifolia) and Creeping Bellflower
(C. rapunculoides).
Seven British miners are recorded on Campanula.
A key to the European miners recorded on Campanula is provided in Bladmineerders van Europa. |
Clustered
Bellflower
Campanula glomerata
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Key for the identification of the known mines of British
Diptera recorded on Campunula
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Note: Diptera larvae may live in a corridor mine, a corridor-blotch mine, or a blotch mine, but never in a case, a rolled or folded leaf, a tentiform mine or sandwiched between two more or less circular leaf sections in later instars. Pupation never in a cocoon. All mining Diptera larvae are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall. The larvae lie on their sides within the mine and use their pick-like mouthparts to feed on plant tissue. In some corridor miners frass may lie in two rows on alternate sides of the mine. In order to vacate the mine the fully grown larva cuts an exit slit, which is usually semi-circular (see Liriomyza huidobrensis video). The pupa is formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).
See Key to non-Diptera.
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1a > Stem miner: An external stem mine with frass in two rows of disconnected strips.
Pupation in stem at end of mine (Spencer, 1972b: 25; Spencer, 1976:
61 (fig. 63B), 65-6). |
Polyphagous. On Campanula, Jasione, Phyteuma [Campanulaceae], Crepis, Hypochaeris and Lapsana [Asteraceae]
in Britain and additional genera of both families elsewhere. Uncommon
in Britain - recorded in London, Warwick and Cambridge. Uncommon
but Widespread in continental Europe.
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Ophiomyia
heringi Stary, 1930 [Diptera: Agromyzidae]. |
1b > Leaf-miner |
2 |
2a > Leaf-miner: A distinctive mine primarily above mid-rib, with irregular short
lateral offshoots into leaf blade. Pupation external (Spencer, 1972:
51 (fig. 172), 55; Spencer, 1976:
270, 271 (fig. 486)).
Branched,
whitish, upper-surface corridor; main axis overlying the midrib;
side branches overlying the main lateral veins. (In Campanula and Phyteuma the mine is much less branched, sometimes nothing
more than a corridor on top of the midrib). Frass in rather long
strings. Usually the mines begins as a long and narrow, shallow,
tortuous lower-surface corridor that ends upon the midrib but otherwise
is not associated with the leaf venation. Often this initial corridor
is filled with callus, and then even less conspicuous. Pupation
outside the mine.
A
linear mine on the upper surface, usually following the midrib and
showing side branches along the veins. The frass is in strings. |
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Polyphagous. On more than 40 host genera in 15 families in Britain including Campanula. Widespread
throughout Britain. Also recorded in the Republic of Ireland.
Widespread in continental Europe.
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Liriomyza strigata (Meigen, 1830) [Diptera: Agromyzidae]. |
2b > Leaf-miner: Mine not primarily above mid-rib. |
3 |
3a > Leaf-miner: A
shallow whitish linear-blotch mine (Spencer,
1976: 164-5, fig. 300).
Upper-surface
blotch, preceded by a very short corridor. Often several larvae
in a mine. Frass in isolated grains. Pupation outside the mine;
exit slit in upper epidermis. |
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On Campanula glomerata and Campanula rotundifolia in
Britain. In addition on other genera and species of Campanulaceae
elsewhere. Recorded in England. Also recorded in the Republic
of Ireland. Widespread in continental Europe. Also recorded in
Japan.
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Amauromyza
gyrans (Fallén, 1823) [Diptera: Agromyzidae]. |
3b > Leaf-miner: An
irregular whitish linear mine which can broaden at end and become
blotch-like (Spencer, 1976:
397). |
On Campanula glomerata, Campanula rotundifolia and Campanula
trachelium in Britain. In addition on other species of Campanulaceae
elsewhere.
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Phytomyza
campanulae Hendel, 1920 [Diptera: Agromyzidae]. |
3c > Leaf-miner: Very long, rather deep corridor, initially lower-surface, later
upper-surface. In smaller leaves almost always a secondary blotch
originates, that can occupy the entire leaf. Frass initially in
pearl strings, later in scattered aggregations. Pupation outside
the mine; exit slit in upper epidermis. |
Hosts in Britain unknown. On Campanula and Phyteuma elsewhere. Added to the British checklist
by Henshaw in Chandler, 1998. Widespread in continental Europe.
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Phytomyza
rapunculi Hendel, 1927 [Diptera:
Agromyzidae] |
Key for the identification of the known mines of British
non-Diptera recorded on
Campanula
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Note:
The larvae of mining Coleoptera, Hymenoptera and Lepidoptera may live in a corridor mine, a corridor-blotch mine, a blotch mine, a case, a rolled or folded leaf, a tentiform mine or sandwiched between two more or less circular leaf sections in later instars. Larva may pupate in a silk cocoon. The larva may have six legs (although they may be reduced or absent), a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding). Larvae of Hymenoptera and Lepidoptera usually also have abdominal legs (see examples). Frass, if present, never in two rows. Unless feeding externally from within a case the larva usually vacates the mine by chewing an exit hole. Pupa with visible head appendages, wings and legs which lie in sheaths (see examples).
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1a > Leaf-miner: In the first instar the larva mines the leaves, forming short,
irregular, blotch-like mines, but in later instars it lives externally,
feeding in spun leaves and often twisting those of tender shoots. Larval head light-brown or yellowish brown, edged with black postero-laterally,
ocellar area blackish; prothoracic plate black edged with whitish
anteriorly; abdomen dull dark green; pinacula distinct, black,
sometimes brownish but with black bases to setae; anal plate large,
black (Bradley et al., 1973).
Small,
full depth mine without a definite shape; little frass. Some silk
is deposited in the mine. The larva soon leaves the mine and continues
feeding among spun leaves. |
Polyphagous. On numerous genera and species of plant families, but not yet
on Campanula, in Britain. On numerous genera
and species of plant families including Campanula elsewhere.
Widespread in Britain and continental Europe. Also recorded from
the Channel Is.
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Cnephasia
incertana (Treitschke, 1835) [Lepidoptera: Tortricidae]. |
1b > Leaf-miner: Rather
narrow corridor, untidy and sometimes branched, starting from the
base of the leaf, in particular the midrib. Sides of the corridor
irregularly eaten out, not really parallel. Frass mostly present,
and then in a central line. The larva is capable of leaving the mine and start a new one elsewhere. These later mines are much broader, and the frass is scattered irregularly.. |
Mine of Orthochaetes
insignis on Prunella vulgaris
Image: © Jean-Yves Baugnée (Bladmineerders van Europa) |
Host
plants unknown in Britain. On numerous genera and species in several plant families, including Campanula,
elsewhere. Widespread in Britain and continental Europe.
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Orthochaetes
insignis (Aube, 1863) [Coleoptera:
Curculionidae]. |
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