With the warmer weather, I'm really seeing the SHB populations rise in weaker hives. Even the strong hive have quite a few, but are keeping them at bay.
Here are some options with links with dealing with SHB issues.
Don's method boric acid
Cheap Bottom Board traps This requires completely taking hive apart to install/change and remove.
Freeman beetle traps expensive
AJ Beetle Eaters works, inexpensive, but is messy and hard to install and remove without spilling.
Entrance traps These look like a good option. No leveling of hive necessary!
Keeping your hive real estate in correct proportion is the best method, but if you have a compost pile or more shade then sun, mechanical SHB removal is a must.