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Weird spot on the leaves

Discussion in 'Issues, Disease and Pests' started by Ryan craig, Nov 9, 2014.

  1. Nov 9, 2014 #1
    Ryan craig

    Ryan craig Active Member

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    I have brought this Screen Shot 2014-11-10 at 8.25.33 AM.png Screen Shot 2014-11-10 at 8.25.44 AM.png Screen Shot 2014-11-10 at 8.25.53 AM.png Dendrobium goldsmithidianum (spelling might be off) and it has these spots on it, I thought it might be burn or water damage, Im hoping its not virus, can anyone help me :) I have separated it for now just in case
     
  2. Nov 11, 2014 #2
    Sean Houtman

    Sean Houtman Active Member

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    It is probably not a virus. Looks more like a bacteria instead.
     
  3. Nov 12, 2014 #3
    Alexey

    Alexey Well-Known Member Supporting Member

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    During that time have you noticed any new spots? What about size of the spots (approximately the same or increasing)? Bacterial infection typically is very fast progressing with mushy (not dry) plant tissue in the affected areas.
     
    Last edited: Nov 12, 2014
  4. Nov 12, 2014 #4
    Ryan craig

    Ryan craig Active Member

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    The area is dry, no new spots have occurred, the other new growth doesn't, the one with the spots is the oldest one with leaves, I still have it separated, the worst leaf is actually yellow and just fell off, maybe it is bacterial, if it is what the best way to deal with it
     
  5. Nov 14, 2014 #5
    Natureman

    Natureman Active Member

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    I'm a big fan of neem oil. I've actually had leaves recover (albeit, the spots were smaller) ImageUploadedByOrchidsForum.com1415977801.015442.jpg ImageUploadedByOrchidsForum.com1415977943.639449.jpg
    Pictures show a Catt leaf then and now, some spots before, none now?
    Regards, John
     
  6. Nov 14, 2014 #6
    Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    The spots on the Dendrobium is caused by fungal infection, but the purple spots on the Cattleya is natural, therefore they may disappear as it matures. (Some Cattleya species and its hybrids have purple spots on the leaves naturally or sometime because of the light level.)
     
    Last edited: Nov 14, 2014
  7. Nov 15, 2014 #7
    Ryan craig

    Ryan craig Active Member

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    ok, what do you suggest, will it kill the plant, the new growths dont have it which im happy about
     
  8. Nov 15, 2014 #8
    Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Probably you don't need to do anything now if the affected leaves have already dropped off and no new ones appear.

    Make sure you have some air movement around your plants. Insects or mites can bring secondary infections like fungal or bacterial....
     
  9. Nov 17, 2014 #9
    2manysmiths

    2manysmiths New Member

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    I have a similar spotting on a dendrobium atrovolarium. I've had it for several years and the spots eventually appear on new growth but the plant survives. It doesn't spread to other plants. Sure wish I could get rid of it though.