My comments were specifically targeted to the emerald ash borer that is attacking all three native ash species in Ontario and Quebec. You need to be aware of it because the chances of it moving west are very good. Whether it will or not, I don't know, but we do know that it's taking every ash in its path.
The emerald ash borer can be treated with a biological treatment called TreeAzin. TreeAzin is not a chemical. It's derived from a tropical tree called the neem tree. Three or four applications cost less than what it costs to cut down and replace a mature ash tree.
One needs to qualify that a little bit. Not every ash is worth saving. I'd be the first to say that. But we're not saving nearly as many ash as we could. We have this product that was developed in Canada, partly with federal government funds, by the way. It's made in Canada and it works. It has proven efficacy, yet we're allowing valuable ash trees to die. It's costing us more to dispose of them and replant them than it would if we just saved them.