Dendrobium with black and yellow spots

[NKOrchid]

Hello, orchid people!

I have an issue with a Dendrobium that I bought about one month ago. I bought it from IKEA, so I have no idea what kind of Dendrobium it is, all I know is that it was cheap and since I've never owned a Dendrobium before, I wanted to give it a go. Unfortunately I didn't notice that it had some black and yellow spots on the leaves and in my opinion they have definitely spread during the time I've had it. It also has an odd "hole" in one of the canes and in between the canes there's some sort of webbing, but I don't know if that's just from usual spiders or if it's yet another thing that's wrong with this poor plant.

I'd love it if you could tell me something about what's wrong with it and what to do about it. I've tried to Google to see what other people have posted and I've looked at tons of pictures, but I can't really find anything that looks the same as this.

The spots are both yellow and black. The yellow spots are not very visible and they don't cover many of the leaves. The black ones however are kind of sunken into the leaf itself and they cover many of the leaves. Some only has one spot, others have more and one has a whole cluster of them. There are also some black spots on the canes.

Here come the pictures!

The media and roots:
Imgur: The most awesome images on the Internet
Imgur: The most awesome images on the Internet

The black spots on the leaves:
Imgur: The most awesome images on the Internet
Imgur: The most awesome images on the Internet

The yellow spots on the leaves:
Imgur: The most awesome images on the Internet

The black spots on the canes:
http://imgur.com/RAwq74x
http://imgur.com/Ntc3rvd

The odd hole in the cane:
http://imgur.com/kLcAfPU

The webbing:
http://imgur.com/ej44WQZ
http://imgur.com/ixaccxZ

The orchid and spike:
http://imgur.com/f3Mbvga
http://imgur.com/sPLnfOX

The old flower spike:
http://imgur.com/bQiFzjf


Hope they help you determine what's going on. Thanks for reading!

NKOrchid

[rbarata]

Welcome NKO
My sugestion is to post a pic so that we can see. It easier and avoids possible incorrect diagnostics.
You can post pics after 5 posts.

In the meanwhile, the webs a tiny webs or of "normal size"?

Note that some dendrobiums lose their leaves in winter, which may be the case.

[NKOrchid]

Thanks, Rbarata!

I know it's hard to tell without pictures. Well, the webs are quite tiny and white. They're close to the media and it kind of looks like it makes a little of the media stick to the underside of some of the leaves that are closest to the media itself.

[rbarata]

When you post pics, post also some close up pics of the leaves. Are there any tiny marks on them, king of silverish in aspect?

[NKOrchid]

I will post plenty of pictures of the media, the roots, the leaves, the canes, the entire plant and the new spike it has.
From what I can see there are no tiny marks of silvery color.

---------- Post added at 05:58 PM ---------- Previous post was at 04:58 PM ----------

Do you think the webs are an issue?

[rbarata]

Do you think the webs are an issue?

When someone mentions spider webs one thing comes immediately to my mind: spider mites.
But it can be just a spider living in your orchid.

[NKOrchid]

Yeah, well. Soon I will have posted 5 post and then the pictures come! I have some great pictures of the webs, too.
Something that confuses me though is that it has a new spike growing. The plant seems to be doing good, despite all the things I think is wrong with it.

[rbarata]

Don't worry. Post the pictures and we will help you.
Dendrobiums from IKEA must be a nobile. I have one too and it loses most of its leaves.

[NKOrchid]

I will. This is the last post before being able to post pictures.

---------- Post added at 08:06 PM ---------- Previous post was at 08:00 PM ----------

I just need someone to answer, so I can finally post them.

[rbarata]

One thing I've noticed is the medium. Does it has some type of soil in it? It seems so. Get rid of it and use medium size bark with leca or perlite.

The spots, I really can't help you 'cause I'm not experienced in that kind of pests. But if it is spreding, it doesn't sound good. But let's see what others have to say.

The webbing...I'm not sure but I would be concerned with spider mites. It has all the looks of it. A home remedy to control it's population is to make a solution of water + 1 soup spoon washdish detergent + a tea spoon of alcohool and spray the plant with it, especially under the leaves and crevisses where these bugs can hide.