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Old 05-02-2016, 03:06 AM
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Cymbidiums with leaf problem

Hi,

I am hoping someone can identify what is happening with several of my Cymbidiums. The upward facing part of the leaf(so bottom of some that are facing up) seem to lose chlorophyll and brown off. It is only happening on older leaves that otherwise appear healthy. Any help would be greatly appreciated.

Thanks,
Ian
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Old 05-02-2016, 06:34 AM
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Yes the leaves were probably moist on a cool morning or night?

Especially the black leaves. Ensure the leaves are try at night and you have good air movement and it shouldn't happen again.

Also spray with a good preventative if you can. But really the plant will recover ok from this provided you keep the leaves dry on the colder nights (and protected under a hard cover).

They will take temps down to freezing as long as they are protected and no moisture on the leaves. Good luck. It would be getting cool now where you are.

PS THis can also happen on warm humid nights where there is little air movement and lots of moisture.
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Old 05-02-2016, 08:38 AM
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As Bolero said.
I've seen this a few times during my winters up here.

And when I water before sunset on a warm and very humid night.
Worse times is when we get heavy rains several nights in a row...not much I can do about Mother Nature's desire to fix all the brown lawns in Florida, at once.
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Old 05-02-2016, 09:02 AM
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I am pretty lucky here as there is almost always a breeze. It can rain every day for two weeks straight but, in between, the moving air dries the leaves. I only remember one summer when the air was still (and I lost a couple of orchids due to fungus issues).
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Old 05-02-2016, 09:45 PM
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Thank you everyone. We, here in Auckland, have had an unseasonably warm autumn. It has not been below 10C (50F) with highs around 23C (74F). Perfect temps for the cooler growing Cyms to set spikes. There have been a few foggy mornings, so no breeze and high moisture. About half the plants have been established in place for a few years; yeah round even unprotected through a few frosts. I've only ever had a problem with the Zygopetalums not appreciating the frosts, and a seedling Cym that was left out in a frost in the past. Although I must admit as they grow larger, and I acquire more orchids they get closer together; thus less air movement.

So the suggestion is fungicide everything?

Cheers,
Ian
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Old 05-03-2016, 03:29 AM
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Quote:
Originally Posted by Hondurensis View Post
Thank you everyone. We, here in Auckland, have had an unseasonably warm autumn. It has not been below 10C (50F) with highs around 23C (74F). Perfect temps for the cooler growing Cyms to set spikes. There have been a few foggy mornings, so no breeze and high moisture. About half the plants have been established in place for a few years; yeah round even unprotected through a few frosts. I've only ever had a problem with the Zygopetalums not appreciating the frosts, and a seedling Cym that was left out in a frost in the past. Although I must admit as they grow larger, and I acquire more orchids they get closer together; thus less air movement.

So the suggestion is fungicide everything?

Cheers,
Ian
Hi Ian,

I use Mancozeb in Victoria and if you can get that it's a good preventative. I imagine you can get it there. We also have unusually warm Autumn.
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Hondurensis (05-04-2016)
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Old 05-04-2016, 02:51 AM
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Thank you Bolero! Yates makes a product with Mancozeb, so I should be able to find it. I will go find something to treat with tomorrow.
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