Before you go spraying stuff, you should probably find out WHERE the nest is first.
If its way up in your attic (and theyre burrowing through your walls or something), then spraying the entrance isnt going to do much since they could probably find another way out.
I would probably consult with the local conservation office, animal control, or pest control (if you can find one thats nice enough to give you ideas instead of saying "we can do it for this price but you cant do it yourself"), first, get some ideas on how to take care of it "eco friendly" and cheaply.
Then if you cant get the nest out by yourself they usually get bigger during the fall and then taper off because of the cold climate changes.
Then just wall up the place and the larva will most likely die.
Although, me personally, I hate them very very much and would probably call Vex Con (from the A&E extermination show.. tattoos and gothic clothing lol). XD
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