The leaf and stem mines of British flies and other insects
 

(Coleoptera, Diptera, Hymenoptera and Lepidoptera)

by Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds

N.B. Links to the latest version of 'Leafminers and plant galls of Europe' are being edited

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TANACETUM. Tansy, Costmary and Feverfew [Asteraceae]


Eight species of Tanacetum are recorded in Britain. These include the native Tansy (T. vulgare) and the introduced Costmary (T. balsamita), Rayed Tansy (T. macrophyllum) and Feverfew (T. parthenium).

Thirteen or fourteen British miners are recorded on Tanacetum.

Sneezewort - Achillea ptarmica. Image: © Brian Pitkin
Tansy
Tanacetum vulgare


Key for the identification of the known mines of British
Diptera recorded on Tanacetum


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.


1a > Stem-miner: A narrow, inconspicuous stem mine. Pupation at the end of the mine (Spencer, 1976: 64).

Fine, upper- or lower-surface corridor, ending in a thick vein. From there the mine extends finally to the rind of the stem. There also the pupation takes place, usually not far from the root collar. Mines in the stem rind often are conspicuous through a red discoloration (Bladmineerders van Europa).

On Achillea, Achillea millefolium and possibly Anthemis, Matricaria and Medicago sativa, but not yet on Tanacetum, in Britain. In Britain widespread in south, not uncommon. On Anthemis, Achillea, Artemisia, Aster, Centaurea, Clinopodium, Crepis, Hieracium, Matricaria, Reichardia, Solidago, Tanacetum, Tripleurospermum, Medicago, Satureja and Stachys elsewhere. Widespread in continental Europe.

Ophiomyia curvipalpis (Zetterstedt, 1848) [Diptera: Agromyzidae].

1b > Leaf-miner: The mine begins as an elongated blotch overlying a strong vein; from there broad tunnels radiate that coalesce in the end. All frass is concentrated at a central point in the floor of the mine. As a result the mine has a brownish-black centre and a paler brownish green seam. The larva often (perhaps always at daylight) rests in the centre of the mine. Primary and secondary feeding lines as a rule quite clear. Pupation outside the mine (Bladmineerders van Europa).

An elongated blotch centred over a vein. There are two types: greenish with a blackish centre and entirely reddish-black (British leafminers).

Trypeta artemisiae puparia
Trypeta artemisiae pupariria
Image: © Willem Ellis (Bladmineerders van Europa)

On numerous genera of Asteraceae, incluidng Tanacetum, in Britain and elsewhere. In Britain more common in the north than in the south. Also throughout the Palaearctic Region except the Mediterranean and Middle Eastern areas.

Trypeta artemisiae (Fabricius, 1794) [Diptera: Tephritidae].

1c > Leaf-miner: Corridor mine.

2

2a > Corridor mine primarily associated with the mid-rib.

3

2b > Corridor mine not primarily associated with the mid-rib.

4

3b > 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 (Bladmineerders van Europa).

A linear mine on the upper surface, usually following the midrib and showing side branches along the veins. The frass is in strings (British leafminers).

Polyphagous. On more than 40 host genera in 15 families in Britain including Tanacetum. Widespread throughout Britain. Also recorded in the Republic of Ireland. Widespread in continental Europe.

Liriomyza strigata (Meigen, 1830) [Diptera: Agromyzidae].

4a > Leaf-miner: Mine linear, whitish, both upper and lower surface. Pupation internal, at the end of the mine with the anterior spiracles projecting through the epidermis (Spencer, 1976: 433).

Upper-surface, less often lower-surface corridor. Frass in isolated grains. Pupation within the mine, usually in a lower-surface puparial chamber (Bladmineerders van Europa).

A long whitish upper surface corridor, which eventually goes lower surface (British leafminers).

Two highly polyphagous species of Chromatomyia, with indistinguishable mines, have been recorded in Britain. These are syngenesiae (Hardy) and horticola (Goureau) which can only be distinguished by the male genitalia. Both species are widespread in Britain and elsewhere, although syngenesiae is almost entirely restricted to Asteraceae. Records on Asteraceae not based on examination of male genitalia are treated in this account as Chromatomyia 'atricornis'.

Chromatomyia horticola is recorded on 160 plant genera in 31 families, of which 55 plant genera in 19 families, but not yet on Tanacetum, in Britain. On Tanacetum elsewhere.

Chromatomya syngenesiae is recorded in Britain on 27 plant genera in the family Asteraceae and many more genera elsewhere, including Tanacetum in Britain.

Chromatomyia 'atricornis' has been recorded on Tanacetum in Britain.

Chromatomyia horticola (Goureau, 1851) [Diptera: Agromyzidae]
OR
Chromatomyia syngenesiae Hardy, 1849 [Diptera: Agromyzidae].

4b > Leaf-miner: A narrow linear mine, with frass in black strips (Spencer, 1972b: 57; Spencer, 1976: 274). Narrow upper-surface corridor.

The corridor often follows nerves, causing it to branch now and then. Frass in strings. Pupation outside the mine (Bladmineerders van Europa).

Puparium yellowish-black.

Mine of Liriomyza tanaceti on Tanacetum vulgare. Image: © Willem Ellis (Source: Bladmineerders en plantengallen van Europa)
Mine of Liriomyza tanaceti on Tanacetum vulgare
Image: © Willem Ellis (Bladmineerders van Europa)

On Artemisia, Chrysanthemum and Tanacetum in Britain and Tanacetum elsewhere. Known only from Surrey and Warwick in Britain. Widespread and not uncommon in much of western Europe

Liriomyza tanaceti Meijere, 1924 [Diptera: Agromyzidae].

4c > Leaf-miner: A narrow linear mine, even in the finest subdivisions of the leaves (Spencer, 1972b: 77, as matricariae ; Spencer, 1976: 478).

Very fine corridor, upper- or lower-surface, even in the narrowest leaf segments. The corridor may be up to 14 cm long (Sehgal, 1971a). Generally the corridor descends towards the leaf base. Frass in pearl chains of loose grains, hardly in strings. Pupation outside the mine (Bladmineerders van Europa). Very fine corridor, upper- or lower-surface, even in the narrowest leaf segments. The corridor may be up to 14 cm long (Sehgal, 1971a). Generally the corridor descends towards the leaf base. Frass in pearl chains of loose grains, hardly in strings. Pupation outside the mine (Bladmineerders van Europa).

On Achillea millefolium, Anacyclus pyrethrum, Anthemis, Tanacetum vulgare, Tripleurospermum, Tripleurospermum maritimum and Tripleurospermum maritimum x inodora in Britain and other Asteraceae elsewhere. Widespread in Britain and continental Europe. Also recorded in Canada.

Phytomyza pullula Zetterstedt, 1848 [Diptera: Agromyzidae].

4d > Leaf-miner: A linear mine, frequently on lower surface at beginning; frass with closely adjoining grains. Puparium black

On Tanacetum in Britain. On Achillea, Leucanthemum, Pyrethrum and Tanacetum elsewhere. Probably widespread in Britain, recorded only in Surrey and Warwick. Widespread in continental Europe.

Phytomyza tanaceti Hendel, 1923 [Diptera: Agromyzidae].

4e > Leaf-miner: The mine begins as a long, quite narrow corridor, usually not far from the tip of a leaf segment. Usually this corridor follows the leaf margin for some distance, but it may also run freely through the blade and may then be stongly contorted. In the end the corridor is directed towards the midrib, where an elongated blotch is formed, overlying the midrib and some of the larger lateral veins. Frass in a nearly continuous line in the initial corridor, in scattered lumps in the later part of the mine. Primary and secondary feeding lines very conspicuous when seen in transparancy. Pupation outside the mine (Bladmineerders van Europa).

The mine starts as a very narrow corridor, usually close to the tip of a leaf segment and following the leaf margin. The later section of the corridor approaches the main vein, where an elongated blotch is made with long broad finger like extensions that lay over the secondary veins. In the initial corridor the frass forms an almost continuous line, in the blotch it is distributed in large scattered lumps. In fresh mines the secondary feeding lines are clearly visible (British leafminers).

On numerous genera of Asteraceae, including Tanacetum in Britain and elsewhere. Throughout the British Isles, more common in the south than the north. Also continental Europe.

Trypeta zoe Meigen, 1826 [Diptera: Tephritidae].



Key for the identification of the known mines of British
non-Diptera recorded on Tanacetum


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).


1a > Leaf-miner and case-bearer: The larva lives outside the mine, protected by a case, and feeds on the underlying plant tissues via a hole cut in the epidermis. From that point it eats away as much leaf tissue as it can reach without fully entering the mine. Mine does not contain frass (Coleophora species)

2

1b > Leaf-miner, but not a case-bearer: The larva lives mainly inside the mine. Mine usually contains frass. In later instars the larva may live sandwiched between two more or less circular sections cut from the leaf.

3

2a > Leaf-miner and case-bearer: A straw-coloured to grey, slender, three-valved case of he type tubular silken case; mouth angle 45° - 60°. The case resembles that of C. trochilella, but the case is more slender, the mouth is narrower and the constriction behind the mouth less deep (Bladmineerders van Europa).

On Achillea millefolium, Achillea ptarmica, Artemisia maritima, Leucanthemum vulgare and Tanacetum vulgare in Britain elsewhere. Recorded in North Hants and South Hants in Britain. Widespread in other parts of Europe and elsewhere.

Coleophora gardesanella Toll, 1954 [Lepidoptera: Coleophoridae].

2b > Leaf-miner and case-bearer: Larva mines leaves. On Eupatorium the case is extended at the anal end by adding silk and widened by cutting a ventral gusset. On Inula the case is firstly extended by adding rings of leaf-cuticle at the oral end, before reverting to the method used when on Eupatorium. The full-grown case is 10 mm long (British leafminers). A slender tubular silken case, about 10 mm long, straw coloured, three valved. Mouth angle about 30° (Bladmineerders van Europa).

Coleophora folicularis larva,  dorsal
Coleophora folicularis larva, dorsal
Image: © Willem Ellis (Bladmineerders van Europa)

On Cirsium, Eupatorium, Inula and Pulicaria, but not yet on Tanacetum, in Britain and Achillea, Anthemis, Carduus, Cirsium, Eupatorium, Inula, Leucanthemum, Pulicaria and Tanacetum elsewhere. Widespread in England. Also recorded in Republic of Ireland. Widespread in continental Europe.

Coleophora follicularis (Vallot, 1802) [Lepidoptera: Coleophoridae].

2c > Leaf-miner and case-bearer: A straw-coloured, slender, three-valved tubular silken case; length about 10 mm, mouth angle 45° - 60°. Larva on the leaf underside. Perhaps because of the plant's dense felt cover, the case is attached with much silk, giving the holes a conspicuous white margin (Bladmineerders van Europa).

On Achillea millefolium, Artemisia absinthium, Artemisia vulgaris, Aster, Leucanthemum vulgare, Tanacetum vulgare and possibly Hieracium in Britain and Achillea millefolium, Artemisia absinthium, Artemisia vulgaris, Leucanthemum vulgare, Tanacetum vulgare elsewhere. Widespread in Britain although there aren't many records. Widespread in continental Europe.

Coleophora trochilella (Duponchel, 1843) [Lepidoptera: Coleophoridae].

3a > Leaf-miner: Initially the larva mines the leaflet, leaving a central line of black frass, then grazes the leaflet tips externally, causing withering (British leafminers). The young larva mines a fine leaf segment completely out, leaving a black, central frass line. Older larvae live free on the the upperside of the leaves, causing window feeding (Bladmineerders van Europa). Larva pupates in an white ribbed cocoon (Bladmineerders van Europa).

On Achillea millefolium and Tanacetim vulgare in Britain and Achillea millefolium elsewhere. Widespread in Britain, although there aren't many records. Widespread in continental Europe.

Bucculatrix humiliella Herrich-Schäffer, 1855 [Lepidoptera: Bucculatricidae].

3c > 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. (Bladmineerders van Europa).

Mine of Orthochaetes insignis on Prunella vulgaris
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 Carduus, elsewhere. Recorded in southern England. Widespread in continental Europe.

Orthochaetes insignis (Aube, 1863) [Coleoptera: Curculionidae].



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