time to put out the paper bag wasp nests If you have lots of nooks and crannies in your yard like we do (rotted wood retaining walls, greenhouse with raised floor, firewood piles, I could go on), then you have lots of places that wasps might like to make a nest.
For the past few years we've put up these paper bags and they deter wasps from making a nest in the area (they don't like to make their own too close to another one - and the paper bags look real enough). My husband makes them with shredded paper in a plastic bag, bunched inside a paper bag - that way they can withstand the elements for a few months.
These still won't keep the wasps from finding your picnic table in the summer, unfortunately...