I had a hive that had a bunch of flies on the front of it. I finally got a decent day to open it up. All med boxes. The top three were filled and active. Two months ago I put in a box not drawn out because they were getting crowded and the last box on the bottom had uncapped honey and some pollen on the frames. When I got to the bottom screened board there was a mustard couple of mounds about three inches across. They were loaded with what I assume to be small hive beetle larva. Six out of 10 frames that were already drawn out, were crawling with the same type of larva. I pulled the bottom box and screen bottom board out and took them a good distance from the other hives I have. I heard that you can freeze the frames but the seasoned beekeeper told me to cut out or destroy the wax frames. If they are frozen and all the few larva left on the frames were frozen, why could I not put them back onto a strong hive? You do this with wax moth damage. The combs were not damaged per-say but the pollen/ nectar mix had whetted all these frames. I did manage to plunge them into my fish/ turtle pond so they would have a snack to eat and then bagged them for the freezer. Thanks Ps I put diatomaceous earth on the crawling larva under the old hive site and where they were falling off the frames onto the driveway.