Leaf spot and Brown spot (maybe?) Can any one offer confirmation/advice

[Arielinwonderland]

My new Vanda baby might have brown spot (if I've diagnosed correctly) and my new Aliceara might have some sort of leaf spot (again, if I'm correct).

They are now in a less humid environment, so I think that should help, but I'd like to know if I've diagnosed these correctly, and I'm dearly hoping that someone might share their advice/preferred methods of treatment with me

Thank you in advance!

[WhiteRabbit]

[Arielinwonderland]

Originally Posted by WhiteRabbit

---------- Post added at 07:20 PM ---------- Previous post was at 07:18 PM ----------

I keep reading that I should cut all infected tissue off and spray the wound with anti-fungal/bacterial chemicals, but the solution i bought suggests that just spraying the surface 3 times (once a week) will kill the infectious agent

[wintergirl]

The only one that looks bad to me is the last picture. The other spots on the first 2 pictures almost look like "sun freckles". How is the plant doing now? Are the brown spots getting bigger, wetter, or drying up?

[gngrhill]

This mostly looks like sun (light) damage to me

[estación seca]

The third photo is worrisome for infection with something, especially the spot with what looks like a ring of soft, wet tissue around the brown dot. I couldn't find a photo like the third in Mote's book on growing Vandas in Florida. There is a chapter on fungal diseases.

Here is a good link from the St Augustine (Florida) Orchid Society:

Orchid Pests, Orchid Diseases

Keep us informed.

[Arielinwonderland]

Thank you all so much for your help!!!!

as far as the Aliceara goes:
The spots are all the same size, but there are so many on so many leaves- it's too difficult for me to tell if new ones are forming.

But- I am guessing that I should move the plant to a shadier spot if the apparent cell-necrosis is due to overexposure
am I right?


The Vanda:
The spots look about the same to me-

Now, that could be because it wasn't actually an infection, or because after posting this, I immediately sprayed my baby down with the "Bayer Advanced 3-in-1 Insect, Disease & Mite Control" I bought from Home Depot when I (gladly) had to cause the extinction of mealy bugs in my home.

I don't know if it will penetrate the cell walls and kill what ever infectious agent may have caused the spots, but the label suggests that it should.

...so... it's a tough call I suppose. I will let you all know if there is any change in the spots, but at the moment I am fairly resolved to continue with the spraying regime Bayer suggested on the label (1 time every week for 3 weeks)

[lotis146]

I agree with the others that the last picture is the worrisome of the group. A lot of Oncidiums get leaf spotting, much like many if not most Zygopetalums/hybrids. In that case I do believe the spotting is from some kind of fungus but it's more an issue of looks. That said I'd keep the Vanda away from others especially when watering. I had something like Brown Rot on my Huntleya and used Inocucor. The rot stopped but I'm still feeling guarded about the plant...that's another story.

Good luck & keep us posted.