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AGERATUM. Flossflower. [Asteraceae]

Only one species of Ageratum is recorded in Britain, the introduced Flossflower (A. houstonianum). Only one dipterous miner, the polyphagous agromyzid Chromatomyia 'atricornis', is recorded on Ageratum in Britain. The polyphagous agromyzids Liriomyza sativae and Liriomyza trifolii, pest species of ornamental and vegetable crops occasionally intercepted at UK points of entry, are recorded on Ageratum. Liriomyza trifolii has been found under glass in England and Wales. All populations have been and continue to be eradicated. Elsewhere the polyphagous agromyzids Chromatomyia horticola, Liriomyza sativae, Liriomyza strigata and Liriomyza trifolii are recorded mining Ageratum. No non-dipterous miners are recorded on Ageratum in Britain.

Key for the identification of the known Diptera mines in Britain.

1> Mine linear, whitish, both upper and lower surface. Pupation internal, at the end of the mine, with the anterior spiracles projecting through the epidermis. Mine of Chromatomyia atricornis on Sonchus olearaceus. Images: Willem Ellis (Source: Nederlandse bladmineerders) Chromatomyia 'atricornis' auctt. [Agromyzidae].

Last updated 29-Jul-2008  Brian Pitkin

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