Oncidium shriveling up, turning yellow!

[JaimeZX]

Hello - relatively new to orchids and new to this board!

I bought this Oncidium at Lowes about six weeks ago. It has been quite beautiful and I have it on the same shelf with my several Phalaenopsis. I have not repotted it yet because it's mid-bloom and I understand repotting is better done when the flowering is over with.

In the last two weeks or so I've noticed the pseudobulbs starting to shrivel up. Having read that Oncidium likes more water than Phalaenopsis, I've been giving it more. I'm confused though between letting the potting medium dry out between waterings and watering more often.

For example, I watered two days ago and the medium is still moist but the pseudobulbs appear even more shriveled than they were before. Which makes me think maybe there's a root issue and I should repot sooner rather than later.

I looked through this thread:
orchidboard.com/community/pests-and-diseases/90029-yellow-shrivelling-pseudobulbs-oncidium.html

That poster's orchid looks healthier than mine at this point. I think I'll wind up repotting this weekend and checking for rotten roots to cut away.

//BREAK BREAK//

I do not understand how peoples' orchids get snails. They don't travel as spores through the air before finding an orchid... are they just a contagion from the nurseries that breed them or what? Thanks.