Thrips made me do it

Sprayed all orchids down, seriously, with Bayer Natria Disease and Pest Spray. Thrips have been 'collaring' my poor vanda roots. Once the root has the thrip ring the ends below the ring turn white and don't seem to be able to absorb water.. maybe they do, but they do not turn green when watered.

Satan's Spawn
 (pic from AOS)

Hoping too, that the anti-fungal properties of the spray will act as a happy preventative, keeping trouble more than a few steps behind.