Leaf spot remedies?

[Angurek]

I grow mostly soft-leaved orchids, so this disease is a problem for me. The spots come out almost overnight, and just mar the appearance of the plant.

The zygopetalinae are prone to spotting, so I know that, to an extent, some spotting is inevitable and normal. But there are spots that are raising red flags for me. Some of them start out as black spots, but then I notice a yellow halo or ring that develops around the said spots. After a few days, the infected leaves yellow and die. Thing is, the plants are perfectly healthy otherwise. They have good root systems, and the unaffected areas are lush and green. I've tried cutting off the infected leaves, but when I do, another leaf starts to spot. Go figure.

Anyone have any natural remedies for spotting? I want to try environmentally-friendly methods before I move to hardcore fungicides.

[Izzie]

If you post pictures people might be able to tell you if it's fungal/bacterial and what to do.

[Angurek]

Originally Posted by Izzie

If you post pictures people might be able to tell you if it's fungal/bacterial and what to do.

Problem is, I can't. I just got a new cam phone, but I don't have the USB connector to upload the pics to my computer. All I can do for the moment is assume it's both and try both types of remedy. Right now, I'm cutting off the affected areas and sprinkling cinnamon on the wounds. But I can only cut for so long, and my poor plants are starting to look mangled.

I'm sorry for the inconvenience.

[Swamper]

Does it look anything like this? PP244/PP164: Physiological Disorders of Orchids: Oedema

[Angurek]

Originally Posted by Swamper

Does it look anything like this? PP244/PP164: Physiological Disorders of Orchids: Oedema

Looks more like this:



What happens is, the spot develops a ring of yellow around its edge. The yellow then spreads to the rest of the leaf, causing it to decline.

Some of my other plants have spots that look like this:



In these cases, the ring around the edge of the spot is translucent. The following day, the spot grows to the size of that ring, and it just keeps enlarging.

[kasper6767]

Try this pdf file in the link below, not sure but can it be Bacterial Brown Spot? Hopefully someone who knoes more than I do will post here soon.

http://www.fantasticorchid.com/PDF/O...ndDiseases.pdf

[ronymelson]

Hi kasper, I think that you are right on this and I really thing that this could be Bacterial Brown Spot, though I'm no expert but I love orchids and have seen a couple of such cases, which led to believe that this could be the work of a bacteria.

[Swamper]

Is there any foul odor?

[Gin]

Thanks for the link Swamper interesting reading ..

[Angurek]

Originally Posted by Swamper

Is there any foul odor?

No, none that I can detect. I can smell the potting medium when I wet it, but that's about it.