I found an Elm Beetle-resistant Ulmus Americana years ago on a customer’s property, and took every seedling the tree dropped, grew them on and gave away over 500 saplings (8-10ft) to re-populate the county. They had a natural genetic resistance to the virus. BTW, the “Dutch Elm Disease” was misnamed; the Dutch were helping us find a cure, which didn’t happen. But the disease was wrongly attributed to them. It was a European Elm bark beetle, from Asia.
http://en.wikipedia.org/wiki/Dutch_elm_disease
They have planted smaller leafed trees like Little Leaf Linden which is also salt resistant I believe.
Thanks for your info.