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Problems with a new Cattleya growth...fungus? Burn?

This is a discussion on Problems with a new Cattleya growth...fungus? Burn? within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Okay, so I've had this large blooming sized Catt. for almost a year now. It ...

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  1. #1
    sand_tiger86's Avatar
    sand_tiger86 is offline Senior Member
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    Default Problems with a new Cattleya growth...fungus? Burn?

    Okay, so I've had this large blooming sized Catt. for almost a year now. It hasn't done a lot since, but it's finally coming into its own. However, this is the only new growth and I have no clue what's wrong with it...at first I thought it was burn, but it's a couple of feet away from the windowsill. I did put it outside for a day or two not long ago and two of the large, mature leaves were burned (I promptly put it back inside) and it looked like this new growth got a little bit of it. But that was weeks ago, and the more it grows out, the more black shows. Now it's yellowing at the tip. It also appears to either be a bifoliate growth (the plant has both uni. and bi.) or a sheath is trying to peak out. It would kill me to cut it off, because it's the only new growth, but if it's a fungus infection from burn or otherwise, I want to protect the plant as a whole. I don't know why I always have these problems with larger-growing Catts! The more compact varieties never give me trouble.

    What do you think it is, and what should I do about it? Thanks all!
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  2. #2
    Halloamey's Avatar
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    I hope for your sake that it is sunburn, since such necrosis is also a symptom of virus.

  3. #3
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    It looks like a fungus to me. Let the plant dry out really well. If you have a fungicide, use it. Cattleyas do best in a fast drying medium. I think Sphagnum moss probably stays wet too long for a cattleya.

  4. #4
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    Make sure you have a good, strong fan blowing across your orchids so that they dry off fast after being watered.

    cheers,
    BD

  5. #5
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    Agreed with that, but you see if it was fungal due to too wet a medium, the rot would have started at the base of the rhizome, but here the black area or tissue damage is at the apex of the new growth, I still think it is some sort of necrosis, what do you think about that?
    Quote Originally Posted by tucker85 View Post
    It looks like a fungus to me. Let the plant dry out really well. If you have a fungicide, use it. Cattleyas do best in a fast drying medium. I think Sphagnum moss probably stays wet too long for a cattleya.

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    espranch is offline Senior Member
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    This does NOT look good to me...I believe that the tender new leaf got burned in the sun. Two days would have been plenty enough to burn that new growth! And...I certainly do know what I'd do if the orchid were mine...Betty

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    sand_tiger86's Avatar
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    Thanks guys. Here's the thing: I never get the leaves wet when watering. There's only a thin layer of sphag, beneath it course bark so the sphag dries out rather quickly and I do have a fan blowing at all times on my plants.

    I dunno...
    Posted via Mobile Device

  8. #8
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    P.S., what would you do, Betty? Cut it?

    Where is Clint when I need him!

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    espranch is offline Senior Member
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    Unfortunately, it's the only thing to do...IF you don't want to lose the WHOLE orchid. If it were mine, I would not try to save any of that growth...I would cut it off with a very sharp blade, then immediately spray the nub ( and leave a tiny nub ) with alcohol. Then,immediately cover the wet nub with horicultural sulphur. NOT cinnamon! Sulphur will kill any bacteria on the nub; cinnamon will NOT. Within two weeks, you will find that another new growth is starting to grow, probably right next to the nub. I have done this in the past, and it works! Just my opinion...Betty

  10. #10
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    Thank you, Betty. Where would one find horticultural sulphur?

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