I recently bought an Oncidium. I'd had a Phal which bloomed for 7
months. It's not blooming now and I couldn't find another Phal that I
liked so I got the Oncidium. I know little about orchids.

The Oncidium has two flower spikes. I can't tell if it's a single
plant with two spikes or more than one plant. The planting medium
appears to be some kind of moss - no soil. It's in a clay pot. It's
in the same place as the Phal. I water it when it feels dry with
Orchid food - same as I did with the Phal.

One spike is flowering beautifully. The other has many buds but has
not flowered. I noticed the buds were covered with black specs.
Almost like very small poppy seeds. I wiped the all off with a damp
cloth. The other spike is not affected.

What are these? What should I do?

Thanks