I get PDB moth crystals at Walmart pretty cheap. I'm not a big fan of using it, but sometimes I use when I get an infestation. I'll pull the infested frames and zap em with it. I know I can freeze them, but I don't have alot of freezer space and I don't like cleaning up all the little worms off my lean cuisine boxs
If I have an infestation in the hive that trashes the frame, I bag 'em and freeze the little buggers too. I use the PDB in my stored frames and foundation. They are bad in SW FL. If I don't put the stuff in when I store them in a couple of weeks the wretched things are thrashing my combs, etc.