Re: Small Hive Beetles from Hell
I can only say that nematodes _should_ work, and that you'll have to try it to know. Some folks use landscape cloth and rocks under their hives to deny the larvae any chance to pupate. That's what the nematodes do, too, but they eat the larvae rather than dehydrate/starve them. Our beekeepers assn. ordered from Southeastern Insectaries last year, and I heard no complaints, nor had any myself. You would probably find yourself ahead by buying one of the Freeman beetle traps and trying it out.
Of course, if the neverwet flange works, you could just put that over a screened bottom board with screen large enough for the beetles to get through. (But that _does_ seem to work both ways....) Perhaps it just depends upon whether they fly inside the colony. If they only crawl when inside and even crawl to get there, then they can't get off the bottom board.
You have a couple of things you can try. If you do that and report back, you'll have done a public service and learned something in the process.
"I thought I made a mistake once, but I was wrong." (heard often from the late David Sebree) Still making them, myself