Baited jug-traps are a simple, practical fly monitoring device and can be left in place for up to one week to give a continuous sampling of flies.
The same trap can also be used for the purpose of fly control.
The baited jug-trap consists of a 4 litre plastic milk jug with four holes (7.5 cm diameter), cut around the circumference in the upper third of the jug.
About one tablespoon of fly bait containing muscalure is placed in the bottom.
Flies enter, feed on the bait and die in the jug. The number of flies and the species caught can be determined easily.
After one week the bait has reduced effectiveness, so the flies and old bait should be dumped and the bait replaced.
The placement of traps is important: they should be in the same locations week to week, throughout a monitoring period.
The number of traps needed depends upon the precision desired and the level of fly numbers to be detected.
At least six traps should be used per facility.
In poultry houses, an index of 350 flies per trap per week has been used as the threshold for chemical treatment.
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