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HYDROCOTYLE. Pennyworts. [Apiaceae]

Marsh Pennywort or White-rot (H. vulgaris) is the only native species of Hydrocotyle recorded in Britain. Four other species have been introduced, including Hairy Pennywort (H. moschata), New Zealand Pennywort (H. novae-zeelandiae) and Floating Pennywort (H. ranunculoides). Only one dipterous miner, Liriomyza strigata, is recorded on Hydrocotyle in Britain. The agromyzids Liriomyza sativae and Liriomyza trifolii, polyphagous pest species of ornamental and vegetable crops occasionally intercepted at UK points of entry, are recorded on Hydrocotyle. Both species been found under glass in England and Wales. All populations have been and continue to be eradicated. Elsewhere the polyphagous agromyzids Liriomyza bryoniae, Liriomyza sativae, Liriomyza trifolii and Liriomyza strigata are recorded mining Hydrocotyle. No non-dipterous miners are recorded on Hydrocotyle in Britain.

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

1> A distinctive mine primarily above mid-rib, 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]

Last updated 27-Aug-2007  Brian Pitkin

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