Salix Hakuro Nishiki
I have two Salix Hakuro Nishiki standard trees planted about five feet apart separated by a concrete path with fairly deep foundations. They have been in the same location for about four years and have both always performed really well, but this year one is splendid as usual and the other appears to be dying. The leaves are dropping off, some branches have no leaves at all and it hasn't had the lovely new feathery white/pink leaves. The birds use the tree to perch in before heading for their feeders and there a few ants climbing up the branches feeding on aphids. I have checked for Honey Fungus and Phytophthora, but can see no obvious symptoms. Do you have any advice? Many thanks.