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paph leaf problem

This is a discussion on paph leaf problem within the General Orchid Culture forums, part of the Orchid Culture category; Hi everyone. One of my paphs recently developed this strange yellow spot on its leaf ...

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  1. #1
    palbuque is offline Junior Member
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    Default paph leaf problem

    Hi everyone. One of my paphs recently developed this strange yellow spot on its leaf (see photos). Can anyone tell me what this might be? Should I remove the leaf or spray it with anything?
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  2. #2
    Jmoney's Avatar
    Jmoney is offline Senior Member
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    looks kinda ugly. If it's a bacterial rot, it should smell quite foul, and spread quickly. If it stinks, slice off the leaf with an ample margin and dust the cut edge with cinnamon or sulfur.

    It seems to me like it could also be early stages of sunburn, in which case the leaf shouldn't smell foul at all. keep us updated!

  3. #3
    Paphraguy is offline Former User
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    It does look like sunburn to me.

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    e.muehlbauer is offline Junior Member
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    Default paph leaf spot

    I frequently get this type of spot on my paphs. I do not know what it is, but while it may be bacterial or fungal, it is mainly cosmetic and does not spread rapidly. I would just cut off the damaged part by a good margin of healthy tissue, then dust the cut edges with cinnamon. Bacterial rots, like Erwinia, move very quickly, and frequently reappear after surgery. Take care, Eric

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    If you look carefully at your second pic, you'll notice that the spot follows the contours of an indentation. Those identations are very prevalent on Paphs, and I've found that such sunken areas are a lot more prone to burn than the fleshier areas of the leaves that still seem to have their waxy top layers. My vote goes to "burn" as well. But, like Eric said, it's a cosmetic issue. Give the plant less light, and, if you cut the leaf, dust it with antifungal.

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    palbuque is offline Junior Member
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    Thanks for everyone's advice. It's been 10 days since I took those photos, and the leaves have gotten worse. It doesn't smell so it's probably not bacterial rot. Can sunburn spread to other leaves because one of the upper leaves started developing the same problem. Will the plant survive if I cut all the leaves?

  7. #7
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    palbuque, sunburn won't "spread" unless you've kept the plant under the same lighting conditions that caused the burn in the first place--assuming the problem is, in fact, sunburn. Have you tried fungicide yet? Have the brown areas spread to the degree that there would be no healthy tissue left on the leaves if you cut the damaged parts off?

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    palbuque is offline Junior Member
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    Actually, I never really kept it in strong light before so I wasn't sure it was sunburn. But it also didn't seem like bacterial rot to me. I tried spraying it with Physan a few times, but that hasn't help. If I cut off the brown areas, I will one 1 1/2 leaves left. Will that be enough to keep the plant alive?

  9. #9
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    For the Physan to do its work properly on an established problem, you may have to literally soak the plant in Physan and water solution for about an hour. Otherwise, you might try something like Daconil or Capstan powder if you have either of those available. As far as cutting the leaves is concerned, that's a tough call. At this point, with the problem spread as much as it has, if you don't cut the leaves and the infection reaches the crown (the main growing part), the plant will pretty much be lost anyway. So I would go ahead and cut all the diseased parts off by cutting into a decent margin of healthy tissue below the affected areas. Then apply your fungicide or soak. The current growth may not do any blooming for you, but at least you might save the plant and allow it to put out a new growth for you in the future.

  10. #10
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    Quote Originally Posted by lja
    If you look carefully at your second pic, you'll notice that the spot follows the contours of an indentation. Those identations are very prevalent on Paphs, and I've found that such sunken areas are a lot more prone to burn than the fleshier areas of the leaves that still seem to have their waxy top layers. My vote goes to "burn" as well. But, like Eric said, it's a cosmetic issue. Give the plant less light, and, if you cut the leaf, dust it with antifungal.
    Those 'indentations' freaked me out something wild when I got my first paph. I was searching high and low for some answers. I never got any, but since my plant was doing ok, I didn't worry either. I'll be lucky if my origional paph doesn't croak on me. It has fallen of my cart, potted, then repotted after I learned it should be in a smaller pot, basically been through hell and back. If it doesn't die, it must really feel bad for me and is very sympathetic to my clutsiness. That doesn't look right, I need spell check !! :check:

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