Mystery pest chomping roots

[Madmangt]

Help guys! I have a mystery pest problem that I need some help with. My orchids have been outside since may (live in atlanta, ga) and I am seeing lots of root damage in 20-30 of my orchids (mostly cats, dens, and phals). So first I thought it was snails and slugs so bought some sluggo, but no help. When I started looking through the medium closely I didn't find any snails or slugs but I did find what I think is the perp. There were a few "centipede" like bugs in each one. They are about an inch long but never bigger. Any idea what these are? Any ideas on treatment? Thanks!

[Gage]

Until someone can give more expert advice I will put my 2 cents in. I would water everything THOROUGHLY with a solution of 2 ounces of Ajax brand dish soap (cheapest and most effective according to one study) per gallon of water. And then maybe do it again in a week. That should take care of many different bugs. Just make sure everything is watered well the day before because they say that soap does tend to dry them out a bit. I have never had an issue though. Oh, and get all of the leaves, top and bottom, and leaf axils too! Water early in the day so water doesn't sit in the crown or leaf axils for too long. If you rewet everything again the next morning you will reconstitute the soap and kill more bugs.

[Leafmite]

Another way to get rid of critters is to soak the pots in a bucket or laundry tub for a half hour to drown whatever is lurking. I do this twice, a week apart, to catch any that may have hatched from eggs. As I bring plants inside for colder weather, I do this if a plant seems ant-infested.