Cluster Fly

Cluster Fly

CLUSTER FLY: (Pollenia rudis)

7 to 8mm


Large fly with wingspan up to 20mm. Distinctive dark/grey/olive coloured thorax covered in golden hairs.


Likely found in loft spaces and upper floors of southerly facing buildings.

Likely Found:

Parasitic in Earthworms – do not lay eggs on human food – not a health hazard – enter houses to hibernate in late Autumn – gather in loft spaces or wall cavities.


Female lays eggs in soil – eggs hatch and larvae burrow into earthworms.

Control Measures:

Space treatment of roof void with insecticidal fog and vacuum up dead flies, or install ultra violet fly control machines with catch trays removed (in loft spaces). Proofing against this species is almost impossible.

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