Hi Lance,
Kudos to you for giving your tree some TLC!
Check out the Natural Organic Library at:
http://www.dirtdoctor.com/organic/garden/faq/You get there by choosing "Learn" on the homepage, then choosing "Article Library".
You'll find good advice from Howard in the "termite" article. If it was me, I'd try a combination of introducing fire ants, and treating the soil with beneficial nematodes (both are mentioned in the "termite" article).
I'm with you, treat your tree with care and
don't poison it with pesticides when it's already under stress.
Our oak tree -- which was under severe stress when we bought our house 3 years ago -- is now showing myriad signs of wellness as a result of our caring for it properly (and organically).
Howard has said that trees are very resilient. We have found it to be so, and hope you do, too!
Hope that helps!
_________________
God speed!
Cara
**
Take time to stop and smell the flowers!
(or... as my ladybug refrigerator magnet says
"take time to stop and
eat the flowers!"
)