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HORDEUM. Barleys. [Poaceae]

Twenty-three species of Hordeum are recorded in Britain. These include the native Sea Barley (H. marinum), Meadow Barley (H. secalinum), Six-rowed Barley (H. vulgare) and Wall Barley (H. murinum). Six dipterous miners, the agromyzids Agromyza albipennis, Agromyza ambigua, Agromyza nigrociliata, Agromyza rondensis, Chromatomyia milii and Pseudonapomyza atra, are recorded on Hordeum in Britain. Miners on grasses should be reared, whenever possible, to confirm their identity. Records of Chromatomyia fuscula and Liriomyza graminivora, however, are rejected as non-British species. The agromyzid Liriomyza trifolii, a polyphagous pest species of ornamental and vegetable crops occasionally intercepted at UK points of entry, is recorded on Hordeum. Elsewhere the agromyzids Agromyza ambigua, Agromyza albipennis, Agromyza intermittens, Agromyza luteitarsis, Agromyza mobilis, Agromyza nigrella, Agromyza nigrociliata, Agromyza rondensis, Cerodontha denticornis, Cerodontha incisa, Cerodontha lateralis, Cerodontha muscina, Cerodontha pygmaea, Cerodontha superciliosa, Chromatomyia fuscula, Chromatomyia milii, Chromatomyia nigra, Liriomyza flaveola, Liriomyza graminivora, Liriomyza strigata, Liriomyza trifolii and Pseudonapomyza atra; and the ephydrid Hydrellia griseola are recorded mining Hordeum. No non-dipterous miners are recorded on Hordeum in Britain.

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

1> Larvae feed singly, forming an upper surface linear-blotch mine. Pupation either internal or external. Puparium reddish, brown or black, loosely glued to the leaf. Mine of Agromyza albipennis on Phalaris arundinacea. Image: Willem Ellis (Source: Nederlandse bladmineerders) Agromyza albipennis Meigen [Agromyzidae]. -> Leaf-mine normally short and broad. Initially the larva does not feed towards the apex of the leaf. Pupation external. Puparium yellowish-brown Agromyza ambigua Fallén [Agromyzidae]. ->Mine greenish with only single larva, initially running towards apex of leaf before turning back down and developing into a broad blotch. Puparium reddish brown Agromyza rondensis Strobl [Agromyzidae]. ->A substantial linear mine. Pupation internal. Mine of Chromatomyia milii on Holcus lanatus. Image: Willem Ellis (Source: Nederlandse bladmineerders) Chromatomyia milii (Kaltenbach) [Agromyzidae]. ->The young larva first feeds towards the apex of the leaf, later turning and feeding downwards. Several larvae can occur together in a single leaf. Pupation external. Mine of Agromyza nigrociliata on Arrhenatherum elatius. Image: Willem Ellis (Source: Nederlandse bladmineerders) Agromyza nigrociliata Hendel [Agromyzidae]. ->A short narrow mine, generally near apex of leaf. Pseudonapomyza atra (Meigen) [Agromyzidae].

Last updated 05-Aug-2008  Brian Pitkin

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