The larvae of the Agromyzid fly Cerodontha phragmitidis mine the leaves of Common Reed (Phragmites australis). The mine takes the form of a large linear shallow blotch in the leaf blade and the larva usually pupates in the leaf. The puparium is a metallic black, with an elongated posterior section.
Adult: Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.
Leafmine: Please state the host species, and provide a backlit photograph of the mine, and a photograph of the pupa or larva if present.
Damp areas with Common Reed (Phragmites australis).
Mines can be seen in summer and early autumn when the host plant is in leaf.
True status in Britain is difficult to determine due to lack of records, but the species is believed to be widespread.
Rarely recorded in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015