I have some beetle blasters in a couple of hives and they seem to work pretty good, they will not catch "every" beetle, but I really don't think any of them will. Have not tried either one of the others, the beetle jail seems a little pricey to me, and they have not been out long so the jury is still out on them as I see it. The one thing I like is no chemicals in the hive!! G3
Sam, Do you have a problem with beetles? You asked "when" you should put the beetle trap in the hive. Answer....Never, as it should not be a concern here in the north.