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Buy the Yellow jacket bait replacement packs and carry with you. When you get one Take it 50 yards away down wind and open it up.
I have more of an issue with them when I'm getting stuff out of the back of the truck or hooking up the goose neck. I hate getting stung on the under side of my arm!
Coop2424 and BULLBLASTER don't have a problem with yellow jackets, I'll just call them and they will take care of the downed animal.BTW, little side note about the yellow jackets. They don't seem to discriminate between Kifaru and Mystery Ranch, they are more than happy to crawl under either brand and sting the back beneath it.