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(Coleoptera, Diptera, Hymenoptera and Lepidoptera)
by
Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds
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FRAXINUS.
Ash. [Oleaceae]
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Five British miners are recorded on Fraxinus.
A key to the European miners recorded on
Fraxinus is provided in Bladmineerders van Europa.
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 Ash
Fraxinus excelsior |
Key for the identification of the known mines of British
insects (Diptera and non-Diptera) recorded on Fraxinus
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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) |
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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. |
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2 > Leaf-miner
and case-bearer: The larva initially forms a gallery along the
midrib, which then goes out along a vein. The end of this gallery
is then excised to construct the first case. It then feeds close
to this and makes several small mines.
The
final case is a small, laterally compressed, squat, spatulate leaf
case of 5-6 mm. The dorsal keel has some serrations, remnants of
the leaf margin out of which the case was cut. The rear is twovalved,
and remarkably broad. The mouth angle is 0-10°.
The
description and illustration of the final case in Emmet et al. (1996a)
is not quite clear. They depict a rather slender case, and state
that the mouth angle is 30°. But, as the only illustration in
the other literature that would agree with the British badiipennella,
they refer to Hering (1957a, fig. 701): this illustration, however,
has no resemblance to their own figure, and has a mouth angle of
c. 0°.
Emmet
et al. write that the larva begins its life by making a gallery
of 10-15 mm that runs from the midrib along a side vein; out if
this mine the first youth case is excised. |
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On Ulmus, but not yet on Fraxinus, in Britain.
On Acer campestre, Acer platanoides, Corylus avellana,
Fraxinus, Ulmus glabra, Ulmus minor and Ulmus x hollandica elsewhere.
Locally distributed throughout much of England. Widespread in
continental Europe.
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Coleophora
badiipennella (Duponchel, 1843) [Lepidoptera:
Coleophoridae]. |
3a > Leaf-miner: Initially an epidermal mine on the upper surface of the leaf, later
the mine starts to contract and the leaf concealing the mine. Now
the larvae leave the mine and live freely in a downwards rolled
leaflet (Catalogue
of Belgian Lepidoptera).
Larva
solitary in an elongate upper-surface epidermal (thence silvery)
mine. Frass initially in a rust-coloured central line. Later, when
the mine starts to contract and the leaf folds over the mine, the
frass is black and concentrated in a corner of the mine. At this
point the larva leaves the mine, and starts living freely in a downwards
rolled leaflet.
The
mine can be distinguished from that of G.syringella on the same plant as it is a silver colour whereas that of G.syringella is brownish. Pupation in a flimsy white cocoon, attached hammock-wise within
the final cone (Catalalogue
of Belgian Lepidoptera). |
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Caloptilia cuculipennella larva, lateral
Image: © Chris Snyers (Bladmineerders van Europa) |
On Fraxinus and Ligustrum in Britain and Fraxinus,
Jasminum, Ligustrum, Phillyrea and Syringa elsewhere.
Widespread in Britain and continental Europe.
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Caloptilia
cuculipennella (Hübner, 1796) [Lepidoptera: Gracillariidae]. |
3b > Leaf-miner: Larvae usually gregarious. Early mine an epidermal gallery leading
to a contorted blotch with black frass. Subsequently two successive
cones formed by folding the tip of a leaf downwards, as Caloptilia syringella).
Often,
many leaves on a single bush turn brown and curl up with the mines.
The species can be a pest in gardens.
The
mine begins at a row of eggs along the midrib. The emerging larvae
form relatively broad, inconspicuous, lower-surface corridor. Subsequently
a large, grey brown or greenish brown, very opaque upper-surface
blotch is made, occupied by ten or more larvae. The mine makes the
leaf somewhat bumpy, but the leaf does not fold around the mine,
like in Caloptilia
cuculipennella. After some time the larvae leave the mine
and continue feeding, still comunnally, in a downwards rolled leaf. |
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Gracillaria syringella larva
Image: © Willem Ellis (Bladmineerders van Europa) |
On Symphoricarpos, Fraxinus, Jasminum, Ligustrum, Phillyrea and Syringa in Britain and Chionanthus, Forestiera,
Forsythia, Fraxinus, Jasminum, Ligustrum, Phillyrea and Syringa elsewhere. Widespread in Britain, Ireland and continental Europe.
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Gracillaria
syringella (Fabricius, 1794) [Lepidoptera: Gracillariidae]. |
3c > Leaf-miner: As a smaller larva it mines a leaf, but feeds on the buds of
ash in its later stages.
In
late autumn the larvae make an irregular small corridor with dispersed
black frass. Often the corridor widens in the end into an irregular
blotch with much less frass. The mine may begin at an egg shell
(lower picture), but the larvae can leave their mine an start a
new one elsewhere in the leaf; in that case the corridor begins
with a small round opening. Before the leaf is shed the larva leaves
the mine and bores into the bark, where it hibernates. After hibernation
they live as shoot borer, or free among spun leaves. The larva mines the bark of a twig and overwinters
in this. In spring it bores out the terminal shoot - causing it
to droop. |
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On Fraxinus in Britain and Fraxinus and ? Daphne elsewhere. Widespread in Britain, Ireland and continental Europe.
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Prays
fraxinella (Bjerkander, 1784) [Lepidoptera: Yponomeutidae]. |
3d > Leaf-miner: A
short linear-blotch mine, beginning with a small yellowish-brown
pustule. Pupation external (Spencer,
1976: 315, 317 (fig. 569)).
Greenish,
later blackish, tortuous or irregularly star-shaped, upper-surface
corridor, rather strongly widening in the end, and usually forming
a secondary blotch. Frass in the first part of the mine in two ill-defined
rows. Primary and secondary feeding lines present, but short and
criss-cross. Pupation within the mine; the anterior spiracles penetrate
the upper epidermis.
The mine is an upper surface linear mine, becoming a blotch, with two rows of frass. |
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Aulagromyza
heringii puparium
Image: © Willem Ellis (Bladmineerders van Europa) |
On Fraxinus excelsior in Britain and elsewhere. Only
from Surrey, Middlesex and Herts in Britain. Widespread in western
Europe, range extending eastwards to the Kirghiz Republic, Kazakstan
and Uzbekistan
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Aulagromyza
heringii (Hendel, 1920) [Diptera: Agromyzidae].
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