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  • 1 Post By CattyRobb

Dark spots on underside of newest leaf. Freaking out a little bit. Photos attached.

This is a discussion on Dark spots on underside of newest leaf. Freaking out a little bit. Photos attached. within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; ...

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  1. #1
    CattyRobb's Avatar
    CattyRobb is offline Senior Member
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    Default Dark spots on underside of newest leaf. Freaking out a little bit. Photos attached.

    Hey everyone. Just this morning noticed these dark spots on the underside of the newest fully formed leaf of this last of my Cattleya Bella del Caribe to bloom. Itís freaking me out a little. I will attach photos of the bottom and top of said leaf. As an aside, I could swear I noticed raised bumps in roughly the same area a couple of weeks ago and brushed it off as Edema which I have dealt with before in the past. Unfortunately Iím not absolutely sure of this as my brain seems to be having some glitches lately. Iím blaming it on age lol. Anyway any advice would be greatly appreciated. Thanks in advance.

    Robb

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    PS this is a very small plant in general. Leaf is between 1/2 to 3/4Ē total width.
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  2. #2
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    Consensus on Reddit seems to be cold damage. It hadnít occurred to me. First year wintering this cross. My grow room stays around 60 F during the coldest times. I had figured these would be fine with my other Cattleyas, as half of its heritage is C. coccinea, but the ones that more resemble the 1/4 that is C. luteola have all had problems since the weather changed. I chalked it up to fungal/bacterial issues. Iíve never had cold damage before. Upon looking into luteola again, they are a warm growing plant and never really get colder than 70 in their natural habitat. I will bump it up to 65. Iíve separated this one and will keep an eye on it for a while.
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  3. #3
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    That is a bit worrying ! My collection goes down as low as 55 F. On cold winter nights , when here, in the warmest bit of UK the outside is down to the high twenties fairly frequently this month, and I am sure I have a few luteola crosses among my plants.
    But perhaps mine are hardened,a and yours are not ?

  4. #4
    CattyRobb's Avatar
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    Default

    Thatís a possibility for sure and I could be totally off track as well but the condition doesnít seem to have worsened over the last couple of days. It does look like cell collapse of some sort. Maybe the damage resulted from the edema that I may or may not have observed a little while back as well. Iíve resolved to keep more meticulous notes about these things. This particular cross is the only one Iíve had these troubles with, particularly the ones that seem to take after the luteola in growth habit. These were grown in California previously. This will be their first winter with me here in Kentucky. Iím thinking he uses more warmth tolerant coccinea in his breeding as well. I was worried about plants with such a strong coccinea influence in the heat of my summers. Usually I can keep it around 85F but there are a few days it hits 90 in my grow room. They did stress just a little but I was able to keep it under control. Iím definitely hoping itís not something more serious as I would like to keep this one, but if starts going downhill fast I will throw it out. At least itís not my favorite I guess.
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    Forgot to mention weíve had some extreme swings in weather as well recently. One day 60F, the next in the high twenties and vice versa. I wonder if the extremes could have exacerbated things
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    Also was worried it might be Phyllosticta Leaf Spot, which I have never experienced. Have you ever encountered that one by chance?
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  5. #5
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    Hi Robb need to closely monitor hopefully it will heal and not spreading..all the best.

  6. #6
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    Thanks Zainal. We will see in time. I did spray the underside of that leaf with copper based fungicide as a preventative. Fingers crossed.
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  7. #7
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    Also Geoff this is my first year growing year round in this room. I forgot to mention that it was staying at sixty all day and all night. Do you think that could be a factor, not getting the temp up some during the daytime hours?
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  8. #8
    Keysguy is offline Senior Member
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    Robb,

    Did you notice a couple of the leaves on that purple Potinara I posted this morning?
    Look familiar?
    I'm convinced it's from getting "over chilled" while it lived in NH.
    I kept bottom end of my GH temp there at 55 and some of the Catt's just hated it almost as much as I did.
    Note the newer leaves on the Pot are all pristine. Has been in the warm 2+ years now so believe this confirms my theory.

  9. #9
    CattyRobb's Avatar
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    Hey thanks for the insight Leigh. I think youíre onto something. I didnít notice the spots on your plant at first viewing, but it looks very similar. The irregularities in shape of the black spots I have also seen in other photos of cold damaged Catts.
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