CSU Extension Cockroach traps, small, open-ended boxes, contain an attractant and a sticky substance that retains the insects once they enter. Traps can be effective in catching the occasional invader, but they will not eliminate established colonies. Use them to locate infestations and to determine when populations require additional treatment.
Traps are most effective when placed against walls under sinks, in cabinets and in basement corners.
If two nights pass without a capture, move the trap to another likely area.