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green and black mildew or mold

This is a discussion on green and black mildew or mold within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hello everyone, I am in central Fl. I grow my orchids in my screenroom. We ...

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  1. #1
    kdennis14's Avatar
    kdennis14 is offline Senior Member
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    Unhappy green and black mildew or mold

    Hello everyone,
    I am in central Fl. I grow my orchids in my screenroom. We have had rain everyday for the past 2or 3 months. I have most of my orchids in clay pots. Many of them have mold growing
    on the outside of the pot. Is this harmful? What can I do?

    Thank you,
    Karen

  2. #2
    Catt Mandu's Avatar
    Catt Mandu is offline Senior Member
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    Hi Karen
    You can try spraying and wiping the outside of the pot with a mild disinfectant such as hydrogen peroxide. If you are still watering despite the humidity, reducing the frequency of watering could help.

    Good luck!
    Posted via Mobile Device

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    kdennis14's Avatar
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    Thank you Catt. I will cut back on my watering. I noticed that there is also some of the mold inside of the pots. Will this hurt the orchids???
    Orchids are all healthy.
    Thank you Catt, for your response to me.

  4. #4
    ksriramkumar is online now Senior Member
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    Mold can provide environment for other harmful fungi to grow and its pores could also be allergic to humans and pets. You can wipe away with a mild disinfectant or use Physan 20 and drench the pot.You can also see if you can increase the airflow in the screen room by adding a fan.

  5. #5
    78Terp's Avatar
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    I have a growing number of orchids in clay pots here in the dry of Colorado. I haven't had the issue but I do run a fan in most places I have clay with the exception of a couple I have in orchidariums. So I agree with Sriram, use the disinfectant, water less often and increase airflow and the problem should be solved. I do like the fact the pots hold water in their pores but I can see the downside if stays too wet. How are your roots?

  6. #6
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    If it's green, isn't it more likely algae?

    Over the last several years, my approach to growing has taken a fairly significant "shift", and I find i have far fewer issues with algae, molds, and rots:
    1. I have drastically reduced the amount of fertilizer I apply. At one time, my fertilizer concentration was 100-125 ppm N, and now it's roughly 20% of that.
    2. changed to a fertilizer formula that is very low in P & K (K-Lite, 12-1-1)
    3. Stopped using disinfectants as a preventive measure, and try to avoid them altogether, unless I have a severe outbreak.

    The reduction in overall fertilizer use, coupled with the low P, has essentially eliminated algae growth, even in S/H pots.

    By eliminating the use of disinfectants, which kill beneficial microorganisms as well as pathogens, and by reinforcing those beneficials through the use of a plant probiotic (which also helps the algae reduction) I see overall healthier growth, with far fewer problems.

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    Ray, with the low P do you still get good blooming? I read that it isn't the amount of P but the kind you use that matters.

  8. #8
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    Hi,
    I want to thank all of you for helping me to understand. The roots in all of my orchids are good. Harvey, should I unpot a bad one and look? I can add a fan, but I have to constantly watch as when it rains........But, I will do that. I will clean the pots as well. Now I have 2 that have the green growing inside the pot. What should I do?? I am sorry for all of the questions, but this is a new subject for me.
    I want to thank y'all.
    Karen

  9. #9
    78Terp's Avatar
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    My fan stays outside in the rain and when I water. It hasn't had any problems. Nor have I had to worry about getting shocked. And water has hit it and its electronics daily this summer.

    If the mold is on media, I would replace the media while cleaning up the rest of the mold/mildew. As Ray suggested, lower fertilizer concentrations can help alleviate the issue going forward.

  10. #10
    kdennis14's Avatar
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    Thank you Harvey so very much. I just thought electricity ..water well you know. I will cut back on fertilizing for sure. It did not rain today for the first time in I do not know how long. I really appreciate your input. Thank you again.
    Karen

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