My son is deathly allergic to them.
Every year when the weather warms up and I get a non-windy day, I arm myself with multiple cans of wasp spray and spend quite a few hours "hunting" for nests and activity. I look under all eaves, crevices in the barn, hidey holes behind boards, and just about anywhere a nest could be.
I use the foaming kind beacuse it squirts into cracks, holes, and the like much better and it sticks really well.
I really hate harsh chemicals, but this is one time I don't have a choice.
Last summer I had a nest inside one of the arms of my tractor. Everytime I would fire it up, I would get attacked, but I couldn't figure out where they were coming from.
Finally I went out and from a distance watched the tractor and saw them crawling in and out of a small hole that went down inside on of the steele arms of the front loader.
After it got dark (they go "to bed" when it is dark) I emptied about half a can of foam into the hole.
For an everyday trap- a bucket of really soapy dish water with fruit floating in it will draw them to eat the fruit and the soapy water suffocates them when they fall in. Since I have fruit trees and berry brambles this works really well for me.
Also, if you have problems with stink bugs, squirting them with a spray bottle of really soapy water will kill them as well.