Re: Collected a swarm - how do I know if they're pest free?
Won't a break in the brood cycle help a little with mite population?
I would not treat them for anything right now. Learn how to do a mite count and how to check for other diseases too. Before winter, do a mite count.
As Michael Bush said, those bees are not pest free. They carried Varroa mites with them from their last home. As soon as you hive them, small hive beetles will come running.
The best defense against wax moths and small hive beetles is a strong hive. Though traps do help the bees out. There are lots of options for mites.
Try it. What could happen?