I'm not sure what you have is the same thing we see occasionally -- ours
resemble small albino ants.

But in general, for mobile critters nesting in your pots, this is what we
recommend:

Get a good-size dishpan or bucket. Fill with water to a depth about 1"
taller than your pot. Submerge the pot [clay will usually stay down on its
own, plastic may have to be held down or weighted]. The critters will swarm
up out of the water onto the plant -- it may take 5-10 minutes to drive them
all up. Once they're up on the plant where you can get at them, rubbing
alcohol cut 50/50 with water will kill most insects.

Critters nesting in your potting mix are also an indication that your mix is
breaking down; check for that and, if so, your plant should be repotted at
its/your earliest convenience.

--
Kenni Judd
Juno Beach Orchids

http://www.jborchids.com
"Guogang" wrote in message
om...
Hi,

I saw some white bugs in the potting medium. They are very small
(barely visible), hide under the surface barks, move fast(when I
remove the surface barks, they rush to find a dark place to hide),
high quantity (I saw a few clusters of more than 10)

What could this be? How can I deal with it?

Thanks,
Guogang