Help diagnose and treat a few orchids.

[treefisher]

Hi,

I have a few orchids with problems. I'm hoping I can get a bit of guidance here.

The first picture is a Dendrobium that I've had for a about a year. It looked fine until a couple months ago. I noticed spots and yellowing on the new growth. I gave it a physan bath and clipped a few bad leaves. It seemed OK for a while, but now it looks like this. What is it? A disease or fungus?

The second pic shows some nice new roots forming. It wants to live.

The third picture is an Oncidium that I picked up at Lowe's a few months ago. It was mislabeled and on clearance, so I figured I'd try to salvage it. I'm having no luck so far. The psuedobulb on the left was shriveled when I bought it. The middle psuedobulb looked good, but now it seems to be shriveling up as well. The growth on the right has done nothing. It still looks the same as it did at Lowe's.


Any advice?