Since I have learned to keep my bees from having too much space, I don't struggle too badly with beetles anymore in my location. I will sometimes put squares of generic Swiffer sheets in the corners of my boxes if I notice more than a beetle or two in a hive. I do catch a couple bees in the sheets usually, but if there are more beetles than bees caught, I think it's worth it. I also have some beetle traps that hang over the frames which are easy to use, but I haven't needed them in a few years.