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  • 3 Post By tucker85
  • 1 Post By cucubirds

Cattleya Orchid. What disease does this look like?

This is a discussion on Cattleya Orchid. What disease does this look like? within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; I have a huge cataleya species plant that blooms like crazy. Every year it has ...

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  1. #1
    Nicholas is offline Junior Member
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    Nicholas (Robin) Jones
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    Default Cattleya Orchid. What disease does this look like?

    I have a huge cataleya species plant that blooms like crazy. Every year it has 40-50 blooms. Also for several year about a third of the leaves have developed black spots. Not sure what is causing this or how to treat it.

    I would appreciate any input.
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  2. #2
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    tucker85 is offline Senior Member
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    I would say it's either a bacterial infection or a leaf spotting fungus. I'm leaning towards bacterial. Cut off the worst leaves and start treating the plant with Physan 20 once a week for 3 weeks. It's a mild bactericide/fungicide. Put the plant in an area where there's good air movement and don't hang other plants above it where they might drip on it. One more thing, and this may just be an isolated experience for me, but that kind of problem pretty much disappeared when I increased the amount of calcium and magnesium that my orchids got. Either use a fertilizer that contains both of those, often called a cal/mag fertilizer, or use a supplement. I use a supplement called MagiCal twice a month. It's just a suggestion but use the Physan 20 for sure.

  3. #3
    cucubirds is online now Senior Member
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    I agree with Jeff. Using calcium nitrate will decrease chances of getting this ugly spot on cattleya leaves.

  4. #4
    Nicholas is offline Junior Member
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    Default Thanks

    Thanks so much for your responses. I will definitely take your advice.

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