Week before last I was worried about the number of Small Hive Beetles in my hive and read what David Bush said about nematodes, so ordered some.
Last inspection -- no SHB!
Will they now last as a permanent culture in the soil beneath my hive?
>Will they now last as a permanent culture in the soil beneath my hive?
I'm not sure. I used them two years ago and don't have nearly the small hive beetles I did have, but I still have them. SHB are NOT obligate parasites of bees. They can live on rotting fruit. So they will continue to come back.