There was a Bacillus thuringiensis product called Certan which was registered for use in beehives to control wax moths.  The company dropped this product in the U.S. some years ago.  It was a good product, I suppose the economics did not work though.  It is the old minor crop pesticide dilemma, which is also the reason we only have one material registered for Varroa mite control while in Europe they have at least several.
 
Bob Roach