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

 

THUJA. Cedars. [Cupressaceae]


Two species of Thuja are recorded in Britain. Both are introduced and include Northern White-cedar (T. occidentalis) and Western Red-cedar (T. plicata).

Three British miners are recorded on Thuja.

A key to the European miners recorded on Thuja is provided in Bladmineerders van Europa.



Key for the identification of the known mines of British
insects (Diptera and non-Diptera) recorded on Thuja


1# > ? Leaf-miner: Details unknown.

On Chamaecyparis, Cupressus and Juniperus, but not yet Thuja, in Britain and Cupressus and Thuja elsewhere. A species which appears to be on the increase. It is believed to have been introduced with the foodplant and first appeared in Essex in 1988. Since then there have been quite a number of records, mostly from the south-east of England. Widespread in continental Europe.

Gelechia senticetella (Hübner, 1817) [Lepidoptera: Gelechiidae].

1a > Leaf-miner: Oviposition on a young shoot. The larva penetrates a leaf, empties it, leaves it, often by making another hole in the epidermis, and starts a new mine. Older larvae bore in a twig. Pupation external. Mines twigs rurn brown and are dropped.

Mines of Argyresthia trifasciata on Thuja occidentalis Image: © Willem Ellis (Bladmineerders en plantengallen van Europa)
Mines of Argyresthia trifasciata on Thuja occidentalis
Image: © Willem Ellis (Bladmineerders van Europa)

On Chamaecyparis, Cupressocyparis, Juniperus and Thuja in Britain and elsewhere. Widespread in Britain and continental Europe.

Argyresthia trifasciata Staudinger, 1871 [Lepidoptera: Yponomeutidae].

1b > Leaf-miner: During autumn the larva mines a mere 9-12 leaves - the damage is quite inconspicuous. Hibernation occurs within the mine, and during mild days feeding may continue. After hibernation the larva lives as a borer, and empties 4-6 shoots, over a length of 0.5 - 2.5 mm, just below the tip of the shoot. The damaged shoots wilt and die off .

On Cupressaceae, but not yet on Thuja, in Britain and Chamaecyparis, Cupressocyparis, Juniperus and Thuja elsewhere.

Argyresthia cupressella Walsingham, 1890 [Lepidoptera: Yponomeutidae]



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