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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EMEX. Double Gee. [Polygonaceae]


Two species of Emex are recorded in Britain, both introduced.

Two British miners are recorded on Emex.

A key to the European miners recorded on Emex is provided in Bladmineerders van Europa.



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


1a > Leaf-miner: Large upper side blotch or blister mine, which can start with a short corridor. In small leaves the mine can be full depth in places. Often several larvae in a mine; frass irregularly scattered in large lumps. Pupation external.

On Fallopia, Persicaria, Polygonum, Rumex and ? Begonia, but not yet on Emex, in Britain and in addition Begonia [Begoniaceae] and other genera of Polygonaceae elsewhere. Widespread in Britain. Also recorded in the Republic of Ireland. Widespread in continental Europe. Also recorded in Morocco, Algeria, Tunisia, Syria, Israel, Korea, China and Japan.

Pegomya bicolor (Wiedemann, 1817) [Diptera: Anthomyiidae].

1b > Leaf-miner: Linear mine, becoming a blotch. Two or more larvae feeding together. Frass in lines.

Pegomya laticornis puparium
Pegomya solennis puparium
Image: © Willem Ellis (Bladmineerders van Europa)

On ? Oxyria, ? Polygonum and Rumex, but not yet on Emex, in Britain plus Emex and Persicaria elsewhere. Widespread in Britain. Also recorded in the Republic of Ireland. Widespread in continental Europe.

Pegomya solennis (Meigen, 1826) [Diptera: Anthomyiidae].



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