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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BACCHARIS. Tree Groundsel. [Asteraceae]

Only one species of Baccharis is recorded in Britain, the introduced Tree Groundsel (B. halimifolia).

Only one British miner is recorded on Baccharis.

Elsewhere the polyphagous agromyzids Liriomyza sativae and Liriomyza trifolii are recorded mining Baccharis. See also Liriomyza species in Glasshouses and/or Quarantine Interceptions.

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

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

1 > Leaf-miner: A large, brownish blotch, with conspicuous feeding lines. Pupation external (Spencer, 1972b: 62 (fig. 205), 63; Spencer, 1976: 308, 309 (fig. 557)).

Large, brown, upper-surface blotch with conspicuous primary and secondary feeding lines. The feeding lines are the more apparent because the semiliquid frass adheres to them. Pupation outside the mine; exit slit in the upper epidermis (Bladmineerders van Europa).

A short broad gallery, normally at the margin, leading to a blotch with obvious feeding lines in whorls. Mines go brown (British leafminers).

On Solidago canadensis and Solidago virgaurea in Britain. On Aster, Baccharis, Buphthalum, Erectites and Soligago elsewhere.

Nemorimyza posticata (Meigen, 1830) [Diptera: Agromyzidae].

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