I've seen centipedes in moist soil and under mulch around my roses and really don't think they hurt the roses in any significant way. I happen to dislike them a lot and will step on any that I see but as far as I know the roses don't seem to mind them.

Centipedes are mostly predators and plants are not an important part of their diet according to people who've dissected a bunch of them. My understanding is that they will only eat decayed plant material if they are starving. They freak me out when they run across my bed. One of our little lizards spotted one of those really fast zillion legs ones last week and flew by me. He sat on his rock and ate it. Then he did a couple of pushups and his belly turned blue. He was really proud of himself. Hope you have some lizards. Mary