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LOLIUM. Rye-Grasses. [Poaceae] |
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Six species of Lolium are recorded in Britain. These include the native Perennial Rye-grass (L. perenne) and the introduced Italian Rye-grass (L. multiflorum), Flaxfield Rye-grass (L. remotum), Mediterranean Rye-grass (L. rigidum) and Darnel (L. temulentum). Four dipterous miners, the agromyzids Agromyza nigrella, Cerodontha incisa, Cerodontha pygmaea and Pseudonapomyza atra, are recorded on Lolium in Britain. Miners on grasses should be reared, whenever possible, to confirm their identity. Elsewhere the agromyzids Agromyza nigrella, Cerodontha denticornis, Cerodontha muscina, Cerodontha pygmaea, Chromatomyia fuscula, Chromatomyia nigra and Pseudonapomyza atra and the ephydrid Hydrellia griseola are recorded mining Lolium. No non-dipterous miners are recorded on Lolium in Britain. |
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1> 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]. ->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]. ->Normally several larvae feed together. Pupation in the mine. Puparium shining black Cerodontha (Poemyza) pygmaea (Meigen) [Agromyzidae]. ->Broad elongated mine; the form is dependent of the leaf form of the host plant. Frass green. Usually a number of larvae together in a mine. Pupation internal. Puparium shining, metallic blue-black, loosely attached by silk. Cerodontha (Poemyza) incisa (Meigen) [Agromyzidae]. |
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Last
updated
27-Aug-2007
Brian Pitkin
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