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POA. Meadow-grasses. [Poaceae]
Twenty-seven species of Poa are recorded in Britain. These include the native Annual Meadow-grass (P. annua), Flattened Meadow-grass (P. compressa), Wood Meadow-grass (P. nemoralis), Smooth Meadow-grass (P. pratensis) and Rough Meadow-grass (P. trivialis) and the introduced Broad-leaved Meadow-grass (P. chaixii). Ten dipterous miners, the agromyzids Agromyza albipennis, Agromyza nigrella, Agromyza rondensis, Cerodontha crassiseta, Cerodontha flavocingulata, Cerodontha fulvipes, Chromatomyia milii, Chromatomyia nigra, Liriomyza flaveola and Pseudonapomyza atra, are recorded on Poa in Britain. Miners on grasses should be reared, whenever possible, to confirm their identity. Spencer (1990) recorded the agromyzid Liriomyza orbona on Bellis perennis, although later he stated the host of L. orbona was unconfirmed, but certainly Gramineae (Spencer, 1976). Later still he gives the hosts as Avena, Deschampsia and Poa (Spencer, 1990), although it is not clear whether any of these are British host records.	Broad-leaved Meadow-grass - Poa chaixii
Elsewhere the agromyzids Agromyza albipennis, Agromyza nigrella, Agromyza rondensis, Cerodontha atronitens, Cerodontha denticornis, Cerodontha fasciata, Cerodontha flavocingulata, Cerodontha incisa, Cerodontha lateralis, Cerodontha muscina, Cerodontha pymaea, Cerodontha superciliosa, Chromatomyia fuscula, Chromatomyia milii, Chromatomyia nigra, Liriomyza flaveola, Liriomyza graminivora and Pseudonapomyza atra are recorded mining Poa. Nine non-dipterous miners are recorded on Poa in Britain (see below). Elsewhere ten additional British non-dipterous miners are recorded on Poa (see below).

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

#>Details of mine unknown. Liriomyza orbona (Meigen) [Agromyzidae]. #>Details of mine unknown. Cerodontha (Dizygomyza) crassiseta (Strobl) [Agromyzidae]. #>Details of mine unknown. Cerodontha (Cerodontha) fulvipes (Meigen) [Agromyzidae]. 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]. ->Larval leaf mine starts as a narrow channel running towards apex of leaf but later develops into a broad blotch running downwards. Frass largely diffused, giving the mine a characteristic greenish appearance. Pupation external. Puparium reddish-brown Agromyza nigrella (Rondani) [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 lower surface mine. Pupation normally in the ground. Puparium yellowish-brown Cerodontha (Phytagromyza) flavocingulata (Strobl) [Agromyzidae]. ->A substantial linear mine. Pupation internal; posterior spiracles projecting through the epidermis. Mine of Chromatomyia milii on Holcus lanatus. Image: Willem Ellis (Source: Nederlandse bladmineerders) Chromatomyia milii (Kaltenbach) [Agromyzidae]. ->Long, narrow, whitish mine. Pupation internal. Puparium yellowish-brown, anterior spiracles projecting through the epidermis. Mine of Chromatomyia nigra on Arrhenatherum elatius. Image: Willem Ellis (Source: Nederlandse bladmineerders) Chromatomyia nigra (Meigen) [Agromyzidae]. ->A narrow whitish linear mine, running down the leaf from the apex, with frass in two rows of separate grains. Pupation external. Puparium orange-yellow to reddish Mine of Liriomyza flaveola on Festuca gigantea. Image: Willis Ellis (Source: Nederlandse bladmineerders) Liriomyza flaveola (Fallén) [Agromyzidae]. ->A short narrow mine, generally near apex of leaf. Larva with each segment bearing a row of characteristic papilli which are retained in the puparium. Pseudonapomyza atra (Meigen) [Agromyzidae].

Non-dipterous miners recorded on Poa in Britain Coleophora tricolor Walsingham, 1899 Lepidoptera: Coleophoridae       Coleophora lixella Zeller, 1849 Lepidoptera: Coleophoridae   Elachista collitella (Duponchel, 1843) Lepidoptera: Elachistidae       Elachista consortella Stainton, 1851 Lepidoptera: Elachistidae     Elachista freyerella (Hübner, 1825) Lepidoptera: Elachistidae   Elachista humilis Zeller, 1850 Lepidoptera: Elachistidae     Elachista maculicerusella (Bruand, 1859) Lepidoptera: Elachistidae Helcystogramma rufescens (Zeller, 1877) Lepidoptera: Gelechiidae   Ochsenheimeria taurella (Denis & Schiffermüller, 1775) Lepidoptera: Ypsolophidae     Additional British non-dipterous miners recorded on Poa elsewhere Elachista adscitella Stainton, 1851 Lepidoptera: Elachistidae Elachista albidella Nylander, 1848 Lepidoptera: Elachistidae Elachista albifrontella (Hübner, 1817) Lepidoptera: Elachistidae Elachista apicipunctella Stainton, 1849 Lepidoptera: Elachistidae   Elachista argentella (Clerck, 1759) Lepidoptera: Elachistidae Elachista bedellella (Sircom, 1848) Lepidoptera: Elachistidae Elachista canapennella (Hübner, 1813) Lepidoptera: Elachistidae     Elachista luticomella Zeller, 1839 Lepidoptera: Elachistidae   Elachista pomerana Frey, 1870 Lepidoptera: Elachistidae     Elachista subalbidella Schläger, 1847 Lepidoptera: Elachistidae

Last updated 20-Aug-2008  Brian Pitkin

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