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This small trap, 56 cm high, 30 cm square catches many Calliphorids when baited with a small piece of fish (just visible in a vial on table top). Note that the 4 entrance holes (1 at each corner) are only 3 cm high.
I 'run' this trap in a shaded corner of the garden.
Any similar net design when baited will probably catch all the meat-eating calliphorids in the area. Simple and effective but the fish does smell after a day or two so best to operate not too close to your house/flat.

A recent "customer" is HERE