Isochnus
foliorum (Müller, 1764)
[Coleoptera : Curculionidae]
Curculio
foliorum
Müller, 1764.
Isochnus
foliorum (Müller, 1764)
Curculio saliceti Paykull, 1792
Tachyerges scutellatus Stephens,
1831.
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Leaf-miner:
As far as known, larvae, pupae and mine are identical to those of
I sequensi (= I. populi) - almost round, brown to brownish black, upper
surface, very opaque blotch, about 1 cm in diameter, without an
initial corridor. Upper epidermis leathery in colour. Often several
mines in a leaf. All frass as a tar-like film on the floor of the
mine (Bladmineerders van Europa).
Larva: The larvae of beetles have a head capsule and chewing mouthparts with opposable mandibles and lack abdominal legs (see examples).
Larva solitary.
Pupa: The pupae of beetles have visible head appendages, wings and legs which lie in sheaths (see examples).
Pupation in the mine; pupa not in a cocoon.
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - larvae:
August - October (Hering, 1957).
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Widespread in Britain Ayrshire,
Caernarvonshire, Cheshire, Cumberland, Denbighshire, Dumfriesshire, Durham,
East Norfolk, East Ross, Glamorgan, Herefordshire, Mid-west Yorkshire,
Monmouthshire, North Lincolnshire, North-east Yorkshire, South-west Yorkshire,
Stafford, West Kent and West Suffolk (NBN
Atlas).
Distribution
elsewhere: Widespread in continental Europe including Bulgaria,
French mainland, Germany, Italian mainland, Norwegian mainland,
Poland, Slovakia, Svalbard and Jan Mayen and Yugoslavia (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.
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