Drooping flowers and dark soggy roots on phalaenopsis

[Leafmite]

Take cotton balls dipped in isopropyl alcohol and wipe down the leaves and main stem of your other orchids to kill any infection that might have gotten on them. If there is anything unaffected by the rot in the afflicted plant, wipe it down with alcohol, too. (roots and flowers are exempt as the alcohol would harm them.) Here are some links that might prove helpful:
These are from orchid societies:

Orchid Pests, Orchid Diseases

http://www.houstonorchidsociety.org/...ySueBottom.pdf