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brown spot on Phalaenopsis (growing)

Discussion in 'Orchid Species' started by ben lee, Dec 15, 2012.

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  1. Dec 15, 2012 #1
    ben lee

    ben lee New Member

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    I have a large brown spot on a leaf of one of my phalaenopsis. Should I cut it off or leave it alone. Thanks for the advice!

    The first picture is the front of the leaf, second is the back of it!
    IMG_20121215_104621vv.jpg IMG_20121215_104635vv.jpg
     
  2. Dec 15, 2012 #2
    Ray

    Ray Orchid Iconoclast Supporting Member

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    If it is growing, remove the leaf, then dust the wound with cinnamon powder to seal it and prevent infection.
     
  3. Dec 15, 2012 #3
    ben lee

    ben lee New Member

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    thank you very much, will do! Just sniped it off. After observing it, the backside of the second leaf is brown too and it seems to be on the backside of the third leaf

    (first pic is the back, second is the front)
    20121215_182317.jpg 20121215_182332vf.jpg
     
  4. Dec 16, 2012 #4
    lepetitmartien

    lepetitmartien Active Member

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    Ben, where are you in the US? I'm not sure it's a disease, it may "only" be a sunburn.

    - The first blotch looked rather violet, which is a mark of a lot of light, and eventually too much.
    - The second leaf seems all violet
    This is from what I see here. A sunburn is not necessarily that bad (save it removes chlorophyl real estate and weakens the plant, that is…) certainly less than some bacterial disease of fungus.

    Note that if I totally went wrong and if it smells bad, or if some liquid oozes, it's definitely bacterial and removing/cinnamon and keeping the plant away form others is just the thing to do. (cinnamon decoction too is a good idea as bactericide all over the plant - but not the roots!)

    If it has the sun, directly, at least some hours/day (even a bit on the subjeted leaves) and you don't live high in latitudes, it's at risk. check this thoroughly.

    Note that if it's a sunburn, cinnamon decoction is a good idea too, as the orchid will be weak so infections can come, and this decoction is a good allrounder against what may be around and nasty.

    Cinnamon decoction:
    - in a small "tea bag", or a small fabric purse, take 3 teaspoons of cinnamon powder
    - let it infuse as is 24 hours in half a liter of alcohol titled 70° (70%)
    - best choice: isopropyl alcohol (70°)
    - else: medicinal Cooper which is 70° too, or Methylated spirit 90° you add water to to have 70° in the end. (470g of alcohol 90° +110g of water = 0.5l of alcohol 70°)
    - remove the bag
    - spray (avoid flowers and roots, you've been warned)

    Fine as bactericide, miticide, insecticide and fungicide. "Organic" and not systemic.
     
    Marni likes this.
  5. Dec 20, 2012 #5
    ZWUM

    ZWUM Bulbophiliac Staff Member

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    Ill have to give the cinnamon decoction a try but what happens if it were to come in contact with plant roots?
     
  6. Dec 20, 2012 #6
    Paul Mc

    Paul Mc Member

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    Try to protect the roots if at all possible. While excellent at killing ailments, it can make the roots stop growing and/or keep them from further healthy formation. Personally, I've not had issues with a bit getting on them though but I'm no pro.
     
  7. Dec 20, 2012 #7
    Paul Mc

    Paul Mc Member

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    The word is disscecation (spelling?)
     
  8. Dec 20, 2012 #8
    lepetitmartien

    lepetitmartien Active Member

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    Desiccation ;)

    Cinnamon perturbs root growth and dries them but it's fine elsewhere, and it smells good.
     
  9. Dec 21, 2012 #9
    Paul Mc

    Paul Mc Member

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    That's the magic word!!! Thanks!!! LOL...
     
  10. Dec 21, 2012 #10
    lepetitmartien

    lepetitmartien Active Member

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    Ben lee, how's this phal going?
     
  11. May 13, 2013 #11
    OrchidWholesalerThailand

    OrchidWholesalerThailand New Member

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    ive seen this often on farms and it seems a common thing - nothing too bad but it can spread so yes the advice of take the leaf out is a good one indeed.