Mold? snail egg? What are these?

[Orchid Whisperer]

Originally Posted by jellycat

Thank you for the advise.

What would you recommend as general preventive methods for new cattleyas?

After potting in new media, I refrain from watering for at least
several days, allowing potentially bruised roots to dry a bit and root injuries to heal. This does no harm to the plant.
After that, I will water sparingly for a couple weeks, then resume normal watering.

There is no chemical needed for preventative care. Good care is preventative after repotting.