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GAZANIA. Treasureflower. [Asteraceae]

.The introduced Treasureflower (Gazania rigens) is the only species of Gazania recorded in Britain. Two dipterous miners, the agromyzids Chromatomyia 'atricornis' and Liriomyza strigata, are recorded on Gazania in Britain. The agromyzids Liriomyza huidobrensis and Liriomyza trifolii, polyphagous pest species of ornamental and vegetable crops occasionally intercepted at UK points of entry, are recorded on Gazania. Both species have been found under glass in England and Wales. All populations have been and continue to be eradicated. Elsewhere the agromyzids Chromatomyia horticola, Liriomyza huidobrensis, Liriomyza strigata and Liriomyza trifolii are recorded mining Gazania. No non-dipterous miners are recorded on Gazania in Britain.

Key for the identification of the known Diptera mines in Britain. 1> Mine primarily associated with mid-rib. A distinctive mine with irregular short lateral offshoots into leaf blade. Pupation external.     Mines of Liriomyza strigata on Sonchus. Image: Crown copyright - courtesy of CSL Liriomyza strigata (Meigen) [Agromyzidae]. ->Mine not primarily associated with mid-rib. 2. 2> 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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