I also enjoy watching them, I occasionally see one when I visit Nebraska. I understand they also fly north of where I live, but haven't seen any close, mostly further north. The local CSA produce family farm said they protected from coming too close to their farm. He also said one crashed not too far north of us a few years ago.
My son in Nebraska watched and filmed a helicopter spraying operation near him, it was quite impressive! They landed on a big trailer to refill.
His neighbor is doing drone spraying, I see that is gaining popularity.
Thanks for sharing,
David