if you dont want to use poisons I have heard the west beetle trap and the cardboard like said above set on the top of the intercover works fine, when top is taken off remove cardboard and throw into soapy water, put a new piece of cardboard back in...... two traps at one time, what the west trap dont get the cardboard does.... Fipronil is used when other methods dont work good enough on bad infestation or continuous hive loses to bettles.