Not a device, but before season opens I spray the legs and floor of my blinds with Demon WP. It is really good for control of spiders, scorpions, and other insects. Mix a packet in a sprayer and when the solutions is sprayed and dries it is odorless, safe to humans and animals, and lasts several months unless heavy rain washes away. I can't prove it is the reason, but since I started using I haven't had a problem with wasp or mud-dobber nests in my blinds either.
Deep in the Heart of Texas
Moslah Shrine Temple - 2B1 ASK1