Sarah from Menasha, Wisconsin writes
Spraying fences down with a general insecticide like Cyzmic CS would be a great way to try and deter nests from being built in crevices along the fence. Cyzmic is a residual insecticide that, once dry, will continue to kill insects that come into contact with it. Focus your spray where they land, and they will pick up the product on their bodies and feet and slowly die from it. It may take time to drop a large wasp population, but treating where they normally build nests will help reduce the number in the area and hopefully stop them before they really get a chance to get a new nest started.
Answer last updated on: 05/29/2018
