I still keep most of my hives is the shade where they have been for years and years.********** Maybe I am just keeping stronger hives with less open space in the hives as before.
Full sun helps some. A weak hive will fall prey no matter where they are located.
Good Luck, Steve
I agree with AllenF and Steve colony strength is all that keeps these little buggers at bay. I almost lost a weak colony to them before I knew what was happening. They were in full sun. I installed a full bottom oil trap under #6 mesh and they died by the hundreds. Where I live is prime SHB breeding ground.
I understand that in locations where the ground is rocky, such as in the mountians, they are not as able to replicate therefore they are not as much of a problem. I can't say this from experience but maybe some others can chime in.