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BLACK SPOT AND YELLOWING LEAVES

This is a discussion on BLACK SPOT AND YELLOWING LEAVES within the New Growers: Ask the Senior Members forums, part of the New Growers category; Help please. Dendrobiums with black spot and oncydiums with yellowing leaves. I live in S ...

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  1. #1
    graydame's Avatar
    graydame is offline Junior Member
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    Question BLACK SPOT AND YELLOWING LEAVES

    Help please. Dendrobiums with black spot and oncydiums with yellowing leaves. I live in S Florida where the humidity is extremely high 10 months out of the year. I water about once or twice a week and fertilize about every month.

    Graydame
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  2. #2
    ischel1's Avatar
    ischel1 is offline Senior Member
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    The oncid look ok. I think the yellowing and spots on them is normal. Whatever is on the Dends, I have also on mine. I'm thinking bacterial or fungi. I use Physan20 and it seems to keep it in check.

  3. #3
    Joan's Avatar
    Joan is offline Member
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    Your oncidium in the clay pot looks as if there is very little medium , so it should be repotted , removing any dead roots and yellow leaves. The photo of the orchid in the basket doesn't show the medium. It may need repotting also. Could the black spots on the den leaves be sunburn?

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