What are these Black spots on my leaves?
 

I got these black spots on the leaves of my Angraecum didieri

http://i124.photobucket.com/albums/p...m/DSC09690.jpg

http://i124.photobucket.com/albums/p...m/DSC09689.jpg

any idea what it is and what could've caused it?

For me it usually is a sign that the orchid was grown under an incorrect temperature range.

I'm not sure what it would be called.

It's harmless unless it keeps spreading. If it keeps spreading it could be a bacterial or fungal infection.

BTW I'm not necessarily saying that your orchid is currently grown under incorrect temperatures, just that it probably was at one point in time or possibly even currently.

You have to provide more details on how you're growing it.

i guess it just happened recently. I have a photo of it when I just got it new and there's no black spots on it

http://i124.photobucket.com/albums/p...m/DSC09639.jpg

It's sitting near the top of the tank were it's a bit warm. Should I move it somewhere a bit cooler?

How warm exactly is it? A number would help a lot.

When you unpacked the plant, was it exposed to the cold? Was it snowing where you live? How did the package arrive?

Also, what's the humidity? Number please.

Is there air circulation (computer fan)? Is it an open top tank?

How bright is the light? What kind of light are you using? How long is the light exposure?

definitely wasnt snowing here. The place I got it from delayed to ship the plant due to cold weather over there, but when I got the plant it didnt have any of those spots. So it's probably because of the conditions Im putting it in.

On where it's at in that pic, it probably get to about mid or high 80's Humidity stays between 70-90+ throughout the day. Air movement in that spot isnt that great.

After reading around the web, I've read that this plant likes it drier. The spot it's at right now get a lot of misting so I moved it somewhere where it gets more air circulation and less water.

Hopefully it'll get better.

I hope so to.

The problem with your plant doesn't appear to be severe anyways. It seems to be growing new roots which is always a big plus.

I wish you the best. :)

It's an early sign of rot in the leaves. The plant looks too wet to me. Mine are kept out of the misting system (yet still in high humidity) and very high light. Those spots will advance until the whole leaf falls off. Now is a good time to move the plant out of constant moisture and give it a dose of Thiomyl.

I agree. I see spots of standing water on the leaves, both now and when it was new, and I see slick of wet all over the whole plant. Interestingly, the water beads are about the same size and shape as the rotspots... eh?

BL

The spots will not necessarily keep advancing, it may if it's too damaged. Normally if the problem is taken care of soon enough, the spots will just stay that way and the leaf will continue to live. The leaf/leaves just look unsightly that's all.

If it ends up falling off, don't panick if at least 3 or 4 of the newer leaves on a vandaceous plant are still alive and the root system is still intact your plant will still keep truckin'.

Oh, yeah, I'll add to the last paragraph of what I just wrote with:

...Provided you've found out what the problem is, dealt with it and changed the problem condition to a condition that the plant can grow healthily.

thanks for all the help guys! I feel optimistic about the problem. The roots are all fine and going strong. it's just that leaf that has all the spots on it. I'll keep you guys posted on how it goes.

where can I buy Thiomyl?

Try Thiomyl OSG23: Camp Lot A Noise Tropicals

ok, I got some from a local Nursery here and I mixed it with water as directed and spray some on the leaves and root system 2 days ago. Then yesterday the leaf was just getting worse and another lower leaf was getting it also. Black spots and some yellowing.

Then now I just came home and turned the lights on to see some progress and I noticed that the first infected leaf just fell off! and the other one that's infected is just getting worse. And I notice a little yellowing on some of the roots of the plant. :(

I'll take some pics tomorrow to show you guys what's going on.

How many time should I spray this stuff on the plant? The medication say that repeat it every 7-14 days if the problem persist. Im thinking of doing it some more right now but i wanna know what you guys think.

Sounds like the plant is still too wet. Try moving to a drier location until the rot stops. Thos spots will not go away, just stop advancing, if the Thiomyl is working. For best success, it should be used when the spots are still light green to yellow. By the time the black occurs, the tissue is dead already. Stick with the label recommendations. Extra applications won't help.

Alright I took your advice and moved it somewhere even more drier, but a little lower also, so it's a little less light.

Here's some pictures of the plant. The other leaf has fallen too. But what are these I circled on the picture? are they new growth points?

http://i124.photobucket.com/albums/p...m/DSC09706.jpg

http://i124.photobucket.com/albums/p...m/DSC09709.jpg

In the first picture (with the circles) one shows a root with a blackened tip (nothing to worry about.) The others are potential spikes. They are clearer in the second photo. I prefer to keep these under approx 1800 FCs light. Not too dim. I am sure your plant will enjoy a bit drier location, but watch the roots. They look just fine right now.

Here is what you have to look forward to:

http://www.orchidboard.com/community...idieri_071.jpg http://www.orchidboard.com/community...1-sep-2008.jpg