Keep Wasps away with a brown paper bag.
The wasps and yellow jackets see it and think it's a hornet's nest and they avoid it.
It's easy, cheap and uses no poison.
Fill a brown paper sack and then tie off the end and hang it up. Voila!
They actually do make a "Bee Free Wasp Deterrent" they are available on Amazon or just use the trick above and see how it works!
