I do not really have a big problem with waps. They tend to gather late summer when grapes, or other sweet aand juicy food, is available. I leave them to it, with a few grapes in a dish on the side, and they are happy.

Of course things can get a little out of hand if a pregnant female decided to give birth in the window case. Profesional help is then needed in the shape of the wasp police, although here they are supplied b y the fire fighters. I had to get one last year as the wasps were swarming on the window frame. Within five minutes they had disappeared, although the remains of the nest are probably still there.