John A. Keslick, Jr. wrote:
Here's some links you may enjoy.
(snip)

Wow, That's a lot of data. I'm not sure my background, which has
little biology, will allow me to properly assimilate it.

Nothing specific, then, that might jump out at you the with the willow?
There are 3 others that are 100 yards away that had none of the die
back.

--Dale--