My parents were having problems with wasps building nests under their deck, so one year my dad read that putting up a paper bag filled with air to resemble a wasps nest would keep real wasps away. I'm not sure if he put it up before any wasps built their nests last year or if it drove them away, but they had no problems with wasps last summer or this summer. Pretty much the same idea as the fake nests from Canadian Tire.
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