Psila merdaria


Length up to 8 mm or more. Members of this family are often called 'Rust Flies' or 'Carrot Flies'. Many of them are bright orange. Psila fimetaria is very similar and careful examination is necessary to arrive at a safe id.

Similar Species

There are two species which are very similar - P. fimetaria and P. merdaria. P. fimetaria has the third antennal joint darkened on the outer side at the base of the arista, and the hairs beneath the second antennal joint longer; whereas P. merdaria has the third antennal joint larger but without darkening at the base of the arista on the outer side, and hairs beneath the second antennal joint shorter.

Identification difficulty

Various habitats but often in areas of lush vegetation and amongst the crops that they target when ready to lay eggs.

When to see it

May to August.

Life History

Larvae live in the roots, bulbs and non-woody stems of plants and can be a pest.

UK Status

To follow

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Species group:
Records on NatureSpot:
First record:
12/05/2013 (Calow, Graham)
Last record:
03/05/2017 (Calow, Graham)

Total records by month

% of records within its species group

10km squares with records

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