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Black spots on under side of leaves

This is a discussion on Black spots on under side of leaves within the New Growers: Ask the Senior Members forums, part of the New Growers category; I know I need pics and will add later tonight but hoping for some quick ...

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  1. #1
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    Default Black spots on under side of leaves

    I know I need pics and will add later tonight but hoping for some quick feedback on this. One of my dendrobiums has been doing great with lots of new growth. Started it small and am really fond of it. Tonight when watering notices small black spots on the under side of leaves of older growth. New growth is spot free. No yellowing present. Does not appear to be brown spot. Looks similar to spots on one of my oncidiums just many more of them. Anybody happen to know if this occurs normally ever. Possibly similar to spots on catts
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  2. #2
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    Also this is a spectabile
    Posted via Mobile Device

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    I have this on the underside of my Bellara. I keep an eye on it but it doesn't seem to do anything. Or........it could be Phyllosticta Leaf Spot.....which I doubt.

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    It looks fungal - possibly Phyllosticta.
    Google "St. Augustine Orchid Society", they have an excellent illustrated page on orchid diseases, including treatment alternatives.

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    Quote Originally Posted by Catt Mandu View Post
    It looks fungal - possibly Phyllosticta.
    Google "St. Augustine Orchid Society", they have an excellent illustrated page on orchid diseases, including treatment alternatives.
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  7. #7
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    Quote Originally Posted by ryanskarma View Post
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    I've been to the site and they don't mention anything like this. It's only in the bottom side not all the way through the leaf like black spot/rot and no yellowing or water marks which confuses me. If anyone has had a similar exp I would appreciate some advice. Thanks all for the contributions.
    Posted via Mobile Device

  8. #8
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    A few of my orchids have also developed these spots. I don't know what it is. I will likely take an orchid to the OS meeting and ask.
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  9. #9
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    If you get an answer at the meeting please post the consensus opinion. Would really appreciate a definitive answer
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  10. #10
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    I will let you know. I looked all over for these spots, too.
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