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CONYZA. Fleabanes. [Asteraceae]

Six species of Conyza are recorded in Britain. These include the native Fleabane (C. canadensis x bonariensis) and the introduced Bilbao Fleabane (C. bilbaoana), Conyza blakei, Argentine Fleabane (C. bonariensis), Canadian Fleabane (C. canadensis), Japanese Fleabane (C. japonica) and Guernsey Fleabane (C. sumatrensis). Only one dipterous miner, the agromyzid Calycomyza humeralis, is recorded on Conyza in Britain. The agromyzid Liriomyza trifolii, a polyphagous pest species of ornamental and vegetable crops occasionally intercepted at UK points of entry, is recorded on Conyza. Elsewhere the agromyzids Calycomyza humeralis, Chromatomyia syngenesiae, Liromyza strigata and Liriomyza trifolii are recorded mining Conyza. No non-dipterous miners are recorded on Conyza in Britain.

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

1> A short linear mine in first instar, later producing a circular or oval blotch. Frass is excreted in a black mass prior to pupation. Puparium firmly glued with frass within the mine. Puparium reddish-brown to black Calycomyza humeralis (von Roser) [Agromyzidae].

Last updated 26-Feb-2008  Brian Pitkin

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