Interesting... If the Green Ash you are describing is a cultivar then perhaps it may not have so much value. On the other hand going out in the "woods" and collect seeds from a more genetically diverse population of Ash trees for future propagation certainly make sense.
Call the NYS DEC and tell them what you are saying here. I'm quite sure they will send someone over ASAP.
There are alot of other issues that ash trees are facing though.
I think he meant to say.... It does happen on occasion, Central Park is a very large area, He knows Dom's Tree service (in Port Washington) and Dom says you can't ever prune every tree.
It's considered a nusiance/non-native invasive tree in NYC and cannot be planted.
I've seen them growing by railroad tracks and in the cracks of old building foundations...... really tough trees and showy flowers. I think in a highly urbanized area they would make a great tree because they...
They are not only eating the phloem but also eating the cambium. If you see gallaries in/on the xylem then you know they are getting a "Belly-full" there too. If the Scales probosis makes it all the way into that cambium region then certainly there is a good chance they will get wacked.
Phloem feeder or a xylem feeder?
Merit does not "readily" move into the phloem so targeting a phloem feeder with a material the "stays" in the xylem may not be the best choice.
My saw has got to be at least 12 years old and I have done nothing to it. Besides a new bar and a few chains. It does constantly hemorrhage gas but that's it. Same spark plug that came with it.