You might want to reconsider using those traps...
Studies conducted at the University of Kentucky and Easter Illinois University showed that beetles attracted to pheromone traps frequently do not end up in the traps, but alight on plants in the vicinity, thus causing more damage along the flight path of the beetles and near the trap than may have occurred if the trap were not present. Research performed by many USDA extension service branches has also shown pheromone traps attract more beetles than they catch.