Jim from Edgerton, Wi writes
I live in Wisconsin.
The Demon Max label (page 7) states that liquid may be sprayed directly into gallery entrance holes mixing at 1/2 fl oz per gallon of water. It is recommended to spray around the holes so when the Carpenter Bees land on the surface, they will pick up the active ingredient. Spraying the whole house would be unecessary and better to focus on areas where holes are already present. Following treatment, the entrance holes may be left open 24 hours to be certain that returning adult bees are killed. When there is no activity, the hole may be closed with wood putty.
Answer last updated on: 06/01/2016