I don't know how you're growing your Sophronitis, but I'll share my experience anyway.
I've actually had so-called "beneficial" wasps fly up to my Vandas and strip the velamen off the roots. When I watered my plants, I noticed that some of their roots looked peeled, as if someone had gone over them with a miniature wood plane. I didn't actually know what caused it until I caught the culprits in action.
But I'll agree with what everyone else has posted. If you're growing it in a pot, it could be fungus gnats (you can tell they're there if you see a bunch of small black flies scramble away when you disturb the pot). If the plant's close to the ground, it could also be gastropods (I.E. snails and slugs), or large insects like cockroaches or beetles.
Last edited by Angurek; 03-24-2011 at 12:49 PM..
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