Is this snail damage on my Intergeneric Oncidium?

[Roberta]

I don't have pets or small children, so when I find the little slimeys I am fine with napalm... metaldehyde, the higher percentage the better for snails, that or Sluggo for slugs. If animals or kids are around, you do need to keep them well away from the bad stuff. Now, if those are bush snails, harder to kill than the regular kind because they live in the moist root zone, where the dessicating baits are less effective. For those, not much that works except cleaning and repotting. With followup snail bait. Any any that you can actually get your hands on, squishing underfoot is very satisfying.