Actually, Michael, I'm not looking to use it on the bees, I'm looking to use it on my cabbage, broccoli, etc. to kill the cabbage worms. The stuff Gardens Alive sells is called BT SSP. KURSTAKI. It's in powder form in a shaker; you shake it onto the plants and it kills the cabbage worms. I just don't want my girls walking through it and dying. I guess if there's a form you can spray directly into the hive, there's no danger, but I'd like to make sure.