But sounds like they're working their way west, just like the jap beetle has.
The traps attract more to your garden. The only way I've seen them effective is where you can encircle your garden area by placing them several yards outside of it. They are yucky to clean, change, and keep up with.
I remember the green stink bug since I was a kid but not this one. Anything that would work in the midwest to eradicate both of these pests would be a good thing. In the east they have introduced a parasitic fly that feeds on the female but not before she's laid some eggs.
The U of MI has been working on a virus that will spread from adult to adult, but that was a few years back, and I haven't heard of anything since.
The only pesticide that really works are those in the neocontinoid class which have residual action, even after a rain, but it kills bees and wasps. I sprayed with Sevin, and it washed right off the next rain, used the max recommended by gardeners, and didn't seem to phase the pests.
Milky spore doesn't work well in the midwest.
One thing my neighbor used that might work on the stink bugs, too, is food grade diatomaceous earth, wet down the plants and sprinkle. It's gritty, and they don't like it. Don't know if it would be cost effective for a large growing operation or not.