Yellow jackets bored a hole through the outside wooden window frame and set up a nest. Somehow they were able to enter the kitchen underneath the inside wooden frame. When accidentally disturbed, we had a swarm of yellow jackets attacking us. We could only use magazines to take care of them. Then we went and bought wasp and yellow jacket spray and sprayed inside and outside.
By CJ
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I had this problem 2 years ago. First make sure there is no way they can get inside your house. Tape ALL wall openings,electrical outlets, window and door frames, etc.. Then buy a couple of cans of expanding insulation foam; the kind you spray into cracks and it foams up. Stick the nozzle as far into the hole they made as you can. Get the can with the long thin straw-like extension, and fill that hole with as much foam spray as you can get in there!
Wait until after dark and it's cool out, so all the yellow jackets will be in the nest. The foam cuts off their oxygen supply and traps them inside, that's why you have to make sure there is no way they can get into your house! I haven't had any come back since I did this. Good luck!
Long ago I discovered that yellow jackets had a fatal urge to eat the maple syrup we made, although I'd venture they would like just about any syrup. I put syrup in a wide dish with rim, so they had no place to perch and sip. They would land in the syrup and that was the end of them. It was amazing to visit the bowl after a few hours and see nothing but black and gold stripes covering the entire dish.
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