A little paper nesting bee tid bit...new nest builders will search out, find and tear fibers from unoccupied nests to enlarge their ever-expanding new nests.
Whenever I need to exterminate an occupied paper nest I do so after sunset by injecting a blast of Sevin 5% garden dust.
I made up a ~16 oz. squeeze bottle w/ a spout to which I have attached a ~18" piece of 3/8" plastic tubeing . The plan is to quickly insert/puncture the loose end of the tube into the upper 1/3 of the nest while inverting the squeeze bottle laced w/ Sevin dust and then giving the bottle a good squeeze to deliver the big dose. Then...it's RUN,FOREST...RUN!
If it so happens that one is able to tolerate leaving this now uninhabited paper nest in place one will not only have taken out that one nest this season but also countless other nests, as even into next spring/season when new bee nesters do start to search out and find and haul away fibers of this old unoccupied nest they will be hauling residual Sevin dust to their new nest sites...and no running will be required on ones part.
Sevin 5% garden dust use requires adherence to labeled/stated instructions and cautions.
DO NOT TRY THIS AT HOME
I am a trained professional.