What and why is it growing on my Nobile Type Dendrobium

[Fairorchids]

First photo (& follow-up photo of same plant) appears to show a Den. nobile (or nobile type hybrid). These plants:
Need a good deal of water & regular fertilizer during spring & summer.
ZERO fertilizer after September 15th.
Reduce watering 90% after October 15th; combined with brighter light and reduced tempererature (if possible).

If you fertilize after Sept 15th, you get keikis instead of buds.

They bloom primarily on new canes, but some hybrids can bloom the year after on 2nd year canes.