Hold on pardner.
That was a poke in the dark from a few pictures of the symptoms.

No kill 'em 'til you see 'em, yah?.
Take a look at the root ball first.
If you re-visit that link, you will see pictures of what to look for.

It's an excellent thread and has all the info that you need to diagnose, and treat for RAs.
Sorry I was too busy to read it again, I was hoping that you were not.

Aloha,
Weeze