Dang! They've moved west to Illinois already? That's faster than predicted. Like Clark says by the time you spot them it's already too late. Though there are some preventative sprays. It'd be kind of hard to sell if there are no signs of distress.
It's killed about half of the Ash here in SW Ohio. My customers have lost trees. I have 4 ash trees in my lawn and there's no signs of the Emerald Ash Borer yet.
It's illegal to transport ash firewood here in Ohio. You have to leave it on site. Kind of like your "before & after" pic on your website.