I have a small plum (1.25" caliper) that I planted Fall 2005. While two
others within 25 feet are growing and doing fine, this one is stunted, has
dead brown leaves on one main branch, several dead branches, and the
remaining leaves are wilted...I doubt this tree will live past the
mid-summer.

I see no sign of insects or fungus. All three plums are in the same type
soil, and have been watered and fertilized the same. Only this one is
dying.

Any suggestions?