>Was it PDB
Yes.
>Thanks for the idea and your thoughts on harming the bees.
The first tree I did with the crystals was in an area of a stone company where customers were coming in contact with bees. The owner just wanted them gone, live if possible, but gone as soon as possible without harming the tree. It was an old catalpa with many entrances, so placing the bait hive with the prevailing wind carring it's scent to the entrance was no problem. And with multipal openings in the tree, I could put the crystals in away from the main entrance.
I didn't get as many bees as I thought there might be in the tree. So it is possible that some went up into the tree where they could not get out and sucumed to the vapors. I did get the queen and have a nice nuc hive for my trouble along with a check in the bank
Bottom line is the bees don't like the smell of the crystals and they will come out. Don't use a cone or one way exit, they need the room to get out quick once the vapors build up inside. And if you don't want to leave the crystals inside of a wall, put them in a sock that you can pull out afterward. It is also advised to make doubly sure that the smell is OK with the homeowner, and they understand what the process is.
The two houses I am doing now are swarms that moved in within the last few days, so we are hopeing that they will have little comb left behind.