The bees in most hives will keep the SHB sequestered into an area outside of the brood nest. When you open the box and move frames it creates a diruption and many SHB will try to escape their guards. The bees will chase, harrass and do their best to round up the beetles again. Pretty normal behavior. It takes considerable energy from your colony to maintain that security. Energy that your bees could be spending somewhere more productive. Just let those bees drop their guard for a short period of time, for example the colony goes queenless, and the beetles will take over. Not only that, it seems that a colony in any form of distress attracts even more beetles.
So, enjoy the chase but keep in mind that it'll only take a little distraction and your colony of bees can be overrun. Watch 'em close.
ps the little monsters love screened bottom boards at least as well as solid ones.
Last edited by beemandan; 09-16-2007 at 09:32 AM.
Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted. - Emerson