A cartridge (200) for a flying pest trap (100) is adapted to retain a plurality of immobilisation elements (300), for example glue boards. Accordingly, a plurality of immobilisation elements (300) may be conveniently stored within the flying pest trap (100), so that a service engineer servicing the flying pest trap is able to efficiently remove a saturated immobilisation element (300) and expose a further one of the immobilisation elements (300) for use.
