I'm not sure where you are, but they've been in PA for a few years now. At times, it's like something out of a science fiction movie.
From what I understand, they are some invasive type that came from another country in a shipment of some kind? The birds & spiders don't find them tasty so they aren't "controlled" that way. My dog eats dead stink bugs, then throws up.
Good luck getting rid of them. A friend uses her Shop Vac to suck them up. Then she puts duct tape over the Shop Vac openings to keep the little buggers from crawling out.
They are trying to find a warm place for winter. I've found close to 40 of them when I open my gas thingy on my car.
[This message edited by travels at 8:32 PM, October 2nd (Wednesday)]