I've been battling SHB in my hives since I moved to Florida. One thing that I have found that really works is to take a screened bottom board and put it over a plastic tray or container that has about 1/2 inch of soapy water in it. When I open up a hive and find a frame with SHBs on it I'll smack both sides of the frame off the screened bottom board. The bees bounce off the screen and fly away a little POed while the SHB's fall through the screen and drown in the soapy water. I was able to kill about 300 SHBs in one of my hives in under a week. I was checking the hive every two or three days and was just pulling the two outside frames in the top box where the bees were herding the SHBs. I also use Beetle Blasters in all my hives but being able to just go in and clear out an infestation when you see it really keeps the SHBs under control. Every time I open my hives I'll have my SHB death trap ready to use, I just love counting the dead beetles floating in the soapy water at the end of the day. It's a quick and cheap way to knock SHB's out of a hive, after all you are already in the hive performing a inspection anyways. My first design was a frame made out of 1x2's screened over with 1/4 hardware screen which worked fine, I just starting using a SBB this year to see if it holds up. I have heard that using diatomatous earth around the base of the hive will kill the larva stage as it crawls out of the hive and across the ground before it pupates.