Vanda roots yellowing-help?

[cneos]

Sometimes roots will be yellow or brown at the base of the 'branch' because at some time during its development, the root got too dry. As long as the tips of the roots are green, you can be pretty sure that the root is alive. If side roots are dead, you can cut them at the base (with a sterile blade), seal the cut, and response to wound is that new root may develop. The more roots under your plant, the better!