Advice on how to get rid of wasps now in the cold months. Last Summer I had a terrible infestation of wasps underneath a plastic utility shed with a wooden foundation. They were getting in from a hole or holes in the foundation. I was unable to reach or see a nest. I sprayed a couple of dozen cans of insecticide around the holes (different brands, saturate them and it appeared to have little to no effect on them). I sprayed winterizing (orange colored) foam all around the foundation in hopes of preventing egress. Either a small area was missed or they worked their way out. So, short of disassembling the shed and building a new foundation (cinder blocks would be a good but costly solution). Any solutions that have proven to repel wasps etc to insure they will not return? I had a nest in the soffit of the house and was able to knock it down in the Winter. Hopefully, they will not return from that location - or will they? BTW they never bothered anyone from that location. The wasps under the shed were murderous. Thank you!
I have uploaded an image of where I believe the primary place the wasps are entering the shed. The foam evenly covered the holes when it was first applied. However, the weather has done a job on it. The shed is usable as it is. Would really like to avoid disassembling the shed and building a new foundation. Spray cans won't reach. Appreciate any ideas.