Hi Ed, are you sure it's a hive beetle larvae & not a wax moth larvae. Normally if there is beetle larvae anywhere in the comb, it will be accompanied with slimy honey covering the capped honey. The beetles have a knack of walking in honey & spreading it everywhere & turning it rancid.
You will sometimes find wax moth larvae living inside frames of honey. Sometimes you'll see the track they leave while holding a frame up to the light. It's never anything to worry about, at least I don't worry about it.
PS. Hi @Dawn_SD I saw an interesting talk on SHB at a Texas beekeeping conference. Apparently the optimum brood temperature is a little bit hotter than what beetles tolerate. They will hang around the fringes of the brood where it's a couple of degrees cooler. Having said that, as you can imagine, a fully operating hive where the brood temp is correct will have enough workers to chase the beetles away anyway.
Now, as you can imagine, once the worker population decreases, there wont be enough bees to maintain the optimum brood temp. Therefore the brood temp will fall to the comfortable temp for the beetles, thus allowing them to enter the brood area. The lack of worker population that was unable to maintain the brood temperature will be flat out stopping them from laying eggs in the brood.
It's an interesting talk. Another thing that was discussed was the size of the beetles. Apparently beetles under a certain size are unable to reproduce. It's interesting that the small ones come about because the food runs out, not allowing them to reach full size grubs. However they are still able to turn into beetles. So I guess where beetles are concerned, size DOES matter:)
WOW, it only occurred to me while proof reading this. All this time (since joining the forum) I've been talking about drone comb. It just occurred to me that the recently hatched drones that cover a large area of drone comb would not only do nothing to defend against the beetles, they would also do nothing to maintain the hive temp in that area.
PS @Dawn_SD, I found the video. A lot of it went over my head on account of the accent, but I got the general idea. It's really worth watching I think.