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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ACAENA. Acaenas, Piripiri and Piri-Piri-burs. [Rosaceae]

Five species of Acaena are recorded in Britain. These include Pirri-pirri-bur (A. novae-zelandiae). There are reported escapes of non-British species. The BSBI provide a downloadable plant crib for Acaena.

Only one British miners are recorded on Alnus.

Pirri-Pirri-Bur - Acaena nigra. Image: © Linda Pitkin
Acaene novae-zelandiae

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

1 > Leaf-miner: Initially a linear mine which later develops into a conspicuous blotch; frass in two rows in linear section, scattered irregularly in the blotch (Spencer, 1976: 134-5, fig. 237, as potentillae).

Corridor, gradually and considerably widening towards the end. Frass in two rows in the corridor part, further up dispersed irregularly. Pupation outside the mine (Bladmineerders van Europa).

A short broad upper surface corridor leading to a long blotch between veins (British leafminers).

On Agrimonia, Filipendula, Fragaria, Geum, Potentilla, Rubus and Sanguisorba, but not yet on Acaena, in Britain. On additional Rosaceae, including Acaena, elsewhere. Common and widespread throughout Britain. Also recorded in the Republic of Ireland, Europe, Japan, U.S.A. and Canada.

Agromyza idaeiana (Hardy, 1853) [Diptera: Agromyzidae].

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