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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LAURUS. Bay. [Lauraceae]


Only one species of Laurus, the introduced Bay (L. nobilis) is recorded in Britain.

Only one British miner is recorded on Laurus.

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



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


1 > Leaf miner: A long, whitish smoothly-curved upper-surface mine with broken black frass (British leafminers). Oviposition is by means of an ovipositor; what remains is a small scar: no egg shell is visible at the start of the mine. From here a long, sometimes very long, slender, full depth corridor winds throught the leaf, not steered by leaf margin or the leaf venation. The midrib is crossed effortless; the corridor frequently also crosses itself; the section of the leaf cut off then usally turns brown and dies off. Frass in a narrow central line. The larva vacates the mine prior to pupation through an exit in the upper epidermis. The vacated larval chamber is proportionally much longer than in the case of Stigmella mines ( > 3 x longer than broad) (Bladmineerders van Europa). Pupation in a silken cocoon suspended from threads attached to food plant or other vegetation (British leafminers).

Polyphagous. On numerous genera and species in several plant families, including Laurus in Britain but not elsewhere. Widespread in Britain and continental Europe. Also recorded in the Republic of Ireland.

Lyonetia clerkella (Linnaeus, 1758) [Lepidoptera: Lyonetiidae].



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