I use a West SHB trap and only have one but I have two hives. I have been rotating them until I can get a second one. I found a small tray without a top that I would like to put some veggie oil in for a backup trap but I need a top to let beetles in but keep bees out.
Would bees chew through aluminum foil? What about cardboard?
I know they will chew through styrofoam so thats out.