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

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Isochnus sequensi (Stierlin, 1894)
[Coleoptera : Curculionidae]


Isochnus populi Fabricius, 1793 not Linnaeus, 1758
Rhynchaenus sequensi Stierlin, 1894
Isochnus populicola (Silfverberg, 1977).
Isochnus sequensi (Stierlin, 1894).


Leaf-miner: 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).

The mine is also illustrated in British leafminers.

Larva: The larvae of beetles have a head capsule and chewing mouthparts with opposable mandibles and lack abdominal legs (see examples).

The larva is illustrated in British leafminers and Bladmineerders van Europa.

Pupa: The pupae of beetles have visible head appendages, wings and legs which lie in sheaths (see examples).

The pupa is also illustrated in British leafminers and Bladmineerders van Europa.

Adult: Illustrated in British leafminers.

Hosts in Great Britain & Ireland:

Salicaceae        
Populus       Pitkin & Plant (as populicola)
Salix       British leafminers

Hosts elsewhere:

Salicaceae        
Populus balsamifera Eastern Balsam-poplar   Bladmineerders van Europa
Populus x canadensis Hybrid Black-poplar British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Populus nigra Black-poplar British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix alba White Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix babylonica Weeping Crack-willow   Bladmineerders van Europa
Salix caprea Goat Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix cinerea Grey Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix daphnoides European Violet-willow   Bladmineerders van Europa
Salix dasyclados     Bladmineerders van Europa
Salix euxina or x fragilis Crack-willow or Hybrid Crack-willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix pentandra Bay Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix purpurea Purple Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix triandra Almond Willow British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Salix viminalis Osier British Wild Flowers by John Somerville et al. Bladmineerders van Europa

Time of year - larvae: September (British leafminers).

Time of year - adults: Unknown.

Distribution in Great Britain & Ireland: Widespread in southern half of England including Cambridgeshire (VC29), East Kent (VC15), East Sussex (VC14), West Kent (VC16) and West Norfolk (VC28), (NBN Gateway) and Fleet, Hants (British leafminers).

NBN Grid Map:

NBN Grid Map

Isochnus sequensi
NBN Grid Map : NBN Terms and Conditions

Maps are only displayed if the NBN server is active. N.B. Only publicly available records, if any, are shown by default

Distribution elsewhere: Widespread in continental Europe including Bulgaria, ? Corsica, Finland, French mainland, Germany, Hungary, Italian mainland, Moldova, Norwegian mainland, Poland, Romania, Russia East, Slovakia, Sweden and Yugoslavia (Alonso-Zarazaga in Fauna Europaea).

NBN Interactive Grid Maps of known host species:

Populus balsamifera, Populus nigra, Populus x canadensis, Salix alba, Salix babylonica, Salix caprea, Salix cinerea, Salix daphnoides, Salix fragilis, Salix pentandra, Salix purpurea, Salix triandra, Salix viminalis

 

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.

External links: Search the internet:

Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea
NBN Gateway

NHM UK Checklist

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