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  #1  
Old 12-02-2008, 07:20 PM
Aubar Aubar is offline
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colourful spots on leaves - viral infection? Male
Default colourful spots on leaves - viral infection?

Please, help me to identify problem with my Dendrobium purpureum. As You can see in the pictures below, there are necrotic (black spots) and colorful shaped zones on its leaves. Is this a viral, fungal or bacterial infection?
colourful spots on leaves - viral infection?-img_02381-jpg
colourful spots on leaves - viral infection?-img_02382-jpg
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  #2  
Old 12-02-2008, 07:52 PM
Ross Ross is offline
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I'm thinking bacterial, like a rot of some sort.
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  #3  
Old 12-02-2008, 08:12 PM
ronaldhanko ronaldhanko is offline
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I agree with Ross. It looks like something bacterial, but that means you should cut off the infected parts using a clean blade for each cut and then put something (a light bleach solution or listerine or a bactericide) on the cuts and perhaps rub the same over the rest of the leaf surfaces or spray a solution on the whole plant.

Last edited by ronaldhanko; 12-03-2008 at 12:47 PM..
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  #4  
Old 12-03-2008, 10:23 AM
betoguerrero betoguerrero is offline
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I think is bacterial... You should cut them off.... inmediatelly...
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  #5  
Old 12-03-2008, 05:32 PM
Aubar Aubar is offline
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colourful spots on leaves - viral infection? Male
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Thank you for your comments and advices. I cut all the branches, that were affected by this unidentified bacterium strain, (I want to believe it's not a virus), and sterilized wounds.. I hope my orchid will survive such a drastic pruning procedure...
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  #6  
Old 12-05-2008, 12:17 AM
orchids3 orchids3 is offline
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Is it possible that the plant was in a cold draft or got cold drips of water from above?
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  #7  
Old 12-05-2008, 01:51 PM
Aubar Aubar is offline
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colourful spots on leaves - viral infection? Male
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hello,

hmmm.... there is such a possibility...
But we can't say for sure, because we got this plant from Roellke (Germany) just two weeks ago and it already had some brown spots on leafs. The weather during transportation was quite cool and humidity high. I thought it was damaged mechanically during transportation, but then those spots started to spread and color around them changed to yellow and red..
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  #8  
Old 12-05-2008, 06:48 PM
nhman nhman is offline
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colourful spots on leaves - viral infection? Male
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I would vote for a bacterial etiology given the pictures and history. Agree with above recommendations of treatment. Treatment of the remaining cut ends with Cinnamon (listerine or physan also works well...) is also a good idea. Good luck!
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  #9  
Old 12-05-2008, 06:54 PM
orchids3 orchids3 is offline
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Cold water droplets may get that king of thing started but would pick one of the other post for treatment at this point. My heater went out on a cold night recently and a few of my Phals look like that - sure didnt make me happy.
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