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  • 1 Post By Dazed

Very sudden black spots on Stanhopea pseudobulb - pls help!

This is a discussion on Very sudden black spots on Stanhopea pseudobulb - pls help! within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi I purchased a very lovely specimen of Stanhopea nigroviolacea 6 days ago from someone ...

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  1. #1
    Delila is offline Member
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    Default Very sudden black spots on Stanhopea pseudobulb - pls help!

    Hi

    I purchased a very lovely specimen of Stanhopea nigroviolacea 6 days ago from someone who lives near me (same climate). Just yesterday I re-basketed it very carefully, barely disturbing it, and watered it for the first time.

    Today I can see big black spots on the central pseudobulb and hints of the same on some others. What the?! I don't believe they were there yesterday, or I didn't notice them when handling it. What could it be that is setting in so fast, and why? More critically, what should I do, if anything?!



    I was so thrilled to get this particular plant and would hate to think that simply hanging it outdoors in a warm shady spot, doing a conservative re-pot and watering it once, would lead to disaster! Surely these plants are not so fragile?!

    Thanks for any help!

  2. #2
    Dazed's Avatar
    Dazed is offline Senior Member
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    Hi. Sorry to see this happening. This isn't an orchid that I've crossed paths with before, but the black spot I have. I think it's a fungus. If you use some physan 20 or some have used a really weak solution of bleach and water. Remove all potting material and start over with all new stuff, potting mix, clean potting area, tools, use gloves. It could spread. It may have just been waiting there for an opening to sneak in. I may also suggest, as painful as it may be that you amputate, if there are viable roots for the rest of the plant to survive.

    You may not have to if you try something I've found to work sometimes, the physan or bleach water bath then put it to dry for a few days nekked. Yup, no pot, no potting mix, no nothing. A nice lightly humid but not damp area away from prying eyes and paparazzi on a clean sheet of paper. Fungus can grow if there's enough moisture. It may take a light spray of water on the roots only if they look dehydrated in a few days. A week or two usually works for me, but I have a more humid environment. Just keep an eye on the fungus growth and the roots. Keep the moisture to a minimum

    Just note that this may just be bad luck on your part. Trust me, I live on a 166 square mile island, a speck in comparison to Australia, but we have vastly differing micro climates. What was perfect for my best friend in Christ Church, was horrors for me in St. Michael. A twenty minute drive away. Plus the seller you got it from may be in a walled in apartment and you in wooden house. You may have more trees and a lower elevation to the sea, but they the same amount of trees but it's dryer. It's probably just adjustment. Give it some time.

    Hope that helps. Keep us posted.

    ---------- Post Merged at 08:25 AM ----------

    Ooh, I'm such a ninny. I forgot the obvious. Where is it situated? Was it getting a lot of sun before? If not and it was sitting in an area where it's getting more that it's used to it could be sunburn. Still use the method I mentioned to prevent a fungus. As I said before it needs to adjust. Give it time.

  3. #3
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    This is definite black rot. It happens when an orchid is exposed to rainy or damp climates for a long period of time. It usually starts as browning spots that develop into black sunken holes. Unfortunately it is a disease that spreads. It will need to be removed. You do not however need to destroy the whole stalk. With a sharp sterile instrument just cut off the affected area. Treat the area with a solution of three drops bleach per cup water to prevent any new disease and to prevent similar disease from returning. Eventually the holes should "heal" and your plant will be fine. If it has already spread beyond repair then you may have to remove the stalk.

  4. #4
    kspalding's Avatar
    kspalding is offline Senior Member
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    Sorry, just read below the pic. It is unlikely that in a day it is something u did. It takes time to develop. Not that I want to blame a friend .

    ---------- Post Merged at 09:29 AM ----------

    I have sent a treatment (no offense dazed) because the wait and see is not an option and it is not a matter of adjustment. Apparently this forum picks and chooses when it will immediately posts or sends ur response to a mediator. It'll be interesting to see what reply u recieve 1st.

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