Yeah Mick, you know you mentioned a trap outside the hive before they enter. it's probably something for more of a chemist that myself, but what if you could duplicate the alarm pheromone so well that you could put it in a "roach motel" type trap for the beetles (far away from the hives of course - or they'll be irritated all the time - say 30 or 40 meters). just a powerful scent to draw and trap the pests before they ever get in. - I may try it with some bananas and a sticky trap and see how it goes.