I feel so blessed. I haven't seen a SHB is at least two years. If I never see another one, it will be too soon. I have only seen bees on the ground near the hive entrance a few times. During those times they were "balling" a pest of some kind. Even then they were in front of the hive. I would think one could carefully spray one of those "bug away" type things under the hives and do away with the larva as they hatched.
lazy