Hopefully.
All the trees around the one in the picture was either dead or dying.
They don't fgure that the ones we are taking grafting stock from are completely immune, but rather that they have the ability to compartmentalize the fungus.
They had originally found 66 trees here on the island ( we'll move on to the mainland next week). Those were each infected by the fungus by means of placing an ifected chunk of wood from a dying tree in direct contact with the cambium layer.
That took out about ½ of them. The rest survived and will hopefully be the basis from which future ash trees will come.
And yes, that one was a fine specimen.
Had a real fine veneer log on it, too. ( sorry, I am after all a logger).