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

  

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 and 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 and Ireland: Widespread in southern half of England including Cambridgeshire, East Kent, East Sussex, West Kent and West Norfolk (NBN Atlas) and Fleet, Hants (British leafminers).

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 (Fauna Europaea).

NBN Atlas links to 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 Atlas
NHM UK Checklist

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