Dendrobium with black and yellow spots

[NKOrchid]

Yes, the medium is an issue. I haven't re-potted it since it was flowering when I bought it and now it's growing a new flower spike. Should I re-pot it right away anyway?
I will try the solution you're mentioning. How much water should I mix with the 1 table spoon of dish soap and the 1 tea spoon of alcohol?

Thanks for your advice! I hope someone else knows about the spots, since they seem to be the biggest issue.

[rbarata]

I will try the solution you're mentioning. How much water should I mix with the 1 table spoon of dish soap and the 1 tea spoon of alcohol?

1 L, that's how I use it. I would wait until the flowers die. Do you have any other plants nearby? Spider mites are microscopic and have high potential to spread to other plants. So, isolate the affected plants is mandatory, as well as cleaning the surface where the pot is.
Before the spray, gently clean the leaves with alcohol in a piece of cotton, especially under the leaves.

Should I re-pot it right away anyway?

I would wait until the flowers die because, is case of spider mites, they will be also in the spike. If you spray it, the flowers will be damaged. Since spider mites infestations do not cause instant death of a plant, isolate it and start to treat it as soon the flowers die.

Anyway, this is what I would do. Maybe it's better to see what others have to say.

[NKOrchid]

Thanks for sharing your advice.
I'll see if anyone has anything else to say and then I'm gonna test all of it. Hopefully that will get rid of it!

[rbarata]

I'll see if anyone has anything else to say and then I'm gonna test all of it. Hopefully that will get rid of it!

The treatment (spray) must be done 4 times, once a week to cover the complete life cycle of the mites. The spray can't kill the eggs.

[NKOrchid]

Okay. Again, thanks!

[Dollythehun]

In my opinion, this is a Den Phal. I agree w the mite issue. Don't over pot it and use a shallow heavy pot if possible. These are tough. While its usually not good to pot in flower, I've had to do it and it turned out ok. Type this in tbe site search engine and you'll find they are easy growers

[rbarata]

In my opinion, this is a Den Phal

Right! At least, it's not a Nobile.

[NKOrchid]

Thank you for the advice, Dollythehun. I think I'm gonna go ahead and re-pot it tomorrow. At least it will be before the flower buds open.
Do you have any clue about the spots?

[Dollythehun]

Originally Posted by NKOrchid

Thank you for the advice, Dollythehun. I think I'm gonna go ahead and re-pot it tomorrow. At least it will be before the flower buds open.
Do you have any clue about the spots?

I am a novice too but my fav. Den Phal has spots like this with no ill effects. I 'd worry more about the mites and the medium. These will lose their leaves after a couple of years. Also, that "hole" is where a spike started and or finished.
Sr. members correct me if I am wrong.

[NKOrchid]

Okay, I will focus on the mites and medium then I guess the black spots worry me the most, because they're sunken into the leaves and are definitely spreading.
Does your Den Phal have as many black spots as mine?