I would say Cinci, Oh is in the 70% eab kill range. It is much slower than you expect. We were hit around 05 I believe straight down I75, first hit Springboro north of here then the east side of the city. I found the first D holes in my town. There are still some spots they just have not located yet, and of course, treated trees and some treated and given up on mostly for the expense in different stages of decline.
What to do Chewbaca? Inform your client that treatment works if done early enough and at the right time and dose and chems. Let them decide. But often they tire of paying out and later regret it. Chem co. s will tell you that some day you can stop treating...but not in our lifetimes likely.