Help ID what this is.

[angela]

Hi everyone, I,m back after quite a while, and I immediately need your help.
Yesterday I visited an orchid nursery where the owner rents his plants to hotels and villas and after one Tourist season he sells off the plants and brings in a new lot for the next season. the plants are usually healthy and only need some care or re-potting, and they are sold rather cheaply.
To my horror those I bought yesterday (I only noticed it when I got Home) the leaves are all heavily mottled. These are Dendrobium plants. The blooms are quite healthy and so are the buds.
Needless to say I can not find a place far enough away from my collection to put them until I find out what's wrong.
Please have a look and help me.
Angela

[78Terp]

Sunburn?

[chingjervis]

Like what 78terp said, look like it has too much sun.

[maggs]

Glad to see you are back Angela I was wondering where you had gone, well when I see my dens behaving like that I usually drench them with a mild fungicide, and quite recently I have been using some Epsom salts mixed with another fertilizer in a weak mixture and wet them too, I have gotten some responses, but could that be sunburn, I see a few of mine had gotten that and I was worried, but a good long watering in this heat may help them to thrive healthier too, hope that it is nothing serious and just the burn.

[angela]

Thanks to those of you who have responded so far.
This is not sunburn. These plants came from a shade house where they have always been grown.
Thanks for your input.

[cakedaddy]

My immediate guess would be fungal infection.
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[ksriramkumar]

My thoughts would be that it looks like a fungal infection. how does the new leaves look like?. I would suggest you keep this in quarantine and then apply fungicide and keep a close watch on this.

[kspalding]

I noticed a few of mine start to do that during the Vortex. The weather here was fluctuating from 80F during the day to lower 30F at night. I think it was the huge fluctuation in temps. Plants I had for years were affected and some even lost. This year was just unusual. Treating for fungus doesn't hurt but it may also just be that the plant became a little stressed this year.

[wuness]

Angela: I've been fighting something like this for the last year or so. I've shown it to several orchid people (on forums and elsewhere), and it's surprising that I get so many different opinions of it. It has particularly devasted my dendrobiums, bulbophyllums and thin-leaved plants. I'm going to treat it as a fungus or bacterial problem and am going to hit it with Bayer Advanced 3in1 according to instructions (i.e., spray three times every 7-14 days). I'm also going to sanitize the greenhouse with a peroxide-based spray and put fungicide in the evaporative cooler. If that doesn't work, I'll have to focus on slipper orchids which seems to be the only group that isn't affected by it.

Needless to say, I feel your pain.

wuness

[angela]

Thanks everyone.
I am inclined to believe that it might be Fungal, an I will treat for that. The first thing I did was to give the pots and all a good soak in Physan. My next step will be a systemic Fungicide.
These plants are still in quarantine far away from my collection.