The Orchid Forum, for the UK and Europe (previously known as The UK Orchid Forum) • View topic - Zigo spotted leaves - Disease or zigo's nature?
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PostPosted: Mon Feb 06, 2017 12:15 am 
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Hello, my friends

As you know, zigo's are prone to get their leaves spotted due to water sitting on them.
Although I've always been careful to water only the medium, the leaves are progressively getting spotted.
I think this is because of plant's transpiration. The water from this process doesn't evaporate fast enough and stays on the leaves long enough for this to happen.

What do you think? Can this be an explanation? Or this is a disease instead?
The room where it's growing is approx. 53,6 to 59 F (12 to 15 ºC) and HR around 65%.

If you think this is a disease which treatment shall I use, home-remedy or not.

Here are some photos:

Image
Image
Image


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PostPosted: Mon Feb 06, 2017 12:58 pm 
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PostPosted: Mon Feb 06, 2017 2:52 pm 
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As you have indicated many Zygos do suffer from discolouration on their foliage for some reason. This may be just that, but looking at your second pic the area at the bottom of the leaf shaped like a semi-circle would make me think fungal infection but nothing worse than that. A preventative spray with a fungicide would be my chosen course of action.

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PostPosted: Mon Feb 06, 2017 4:10 pm 
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Location: Portugal - Abrantes
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Thanks for the reply, Terry.
I need a sugestion for a fungicide suitable for orchids.
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PostPosted: Mon Feb 06, 2017 6:43 pm 
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Agree with Terry. It's difficult to grow Zygos completely 'clean'. Try increasing air movement around the plants, and don't keep it too warm.

No idea what fungicides are available to you in Portugal but I've not had any problems with any yet. I'm told to avoid copper based ones. Garden centre purchased fungicides very rarely mention orchids specifically, so try on a plant that you don't mind damaging first. Toxicity should show after around a week.

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PostPosted: Mon Feb 06, 2017 7:26 pm 
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rbarata wrote:
Thanks for the reply, Terry.
I need a sugestion for a fungicide suitable for orchids.
Thanks


Any non copper based fungicide marketed for plants should do the trick.

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PostPosted: Mon Feb 06, 2017 10:35 pm 
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Location: Portugal - Abrantes
I live in: Portugal
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My hardiness zone is: 10a
Thank you, my friends.
I'll keep you updated.



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