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Disease, burn or otherwise?

This is a discussion on Disease, burn or otherwise? within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi guys I just joined up, mostly because of one little orchid doing something interesting. ...

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  1. #1
    Ami's Avatar
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    Default Disease, burn or otherwise?

    Hi guys I just joined up, mostly because of one little orchid doing something interesting.
    I rescued 3 orchids from a friend's place where they were under-watered and over-sunned, about 2 months later they are all fine, growing new roots and leaves.

    However, one has developed this rot/cellular breakage or something on the end of the new leaf. The other 2 are totally fine, no one else in the house is having any issues except my jade across the room.
    I've looked at various images of diseases and such but I still haven't figured out what it is... I just wiped it with peroxide to be sure... and it's gotten darker from yesterday. Does anyone know what it is and what to do?
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    Thanks!

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    Catt Mandu's Avatar
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    Cellular damage from under-watering and too much sun is a maybe.

    The other thing I would check, take a cotton swab, moisten with alcohol, then wipe the underside / top of damaged leaves. See a reddish color on the towel/swab afterward? If yes, spider mite damage; treat with a miticide (note that controls meant for insects typically will not work on mites, which are more closely related to spiders).

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    Thanks Catt!
    There's no reddish anything, no animal friends, nothing.
    I figured that it was just cell damage except it appears to be getting worse... today it's definitely darker and squishier - does that happen from alcohol/peroxide typically? Will it just stop or would it be best to cut off the effected area?

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    I would cut off the affected area and sterilize your cutter between cuts. There is a chance, since its squishy and spreading, that its a bacterial rot. Treat the cuts with cinnamon (which is too hard on roots, but helpful on leaves). You aren't getting much benefit from the affected leaves anyway. I haven't seen anything like that on my Phals though, so I don't have experience there to fall back on, just my general first aid. Good luck!

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    That's what I suspected... threw some cinnamon on the area as it is to see if that will work (I'm used to using it on soil typically for other plants so I'm not 100% sure on the amount)... if there's no change I will just cut it tomorrow morning I guess.
    Should I cut it below even the little dents on the edge or just assume the cinnamon will treat it, Carol? Typically I'd cut like 1cm or so past the booboo but it's such a little leaf and the rest of it is in great condition I don't want to cause him more trouble... it's only like a 3 inch leaf...
    Thanks!

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    That looks like mesophyll collapse to me - especially that one contiguous area on the right side of the leaf. If my assessment is correct (really hard to say from just a photo), that damage is caused by sudden cold on warm tissues - most often happens during shipping in cold weather, or watering, allowing cold water to hit the warm leaves.

    It is possible that the necrotic tissue became infected, so I agree with Carol that it should be removed, and the cut dabbed in cinnamon powder.

  7. #7
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    Now that it has become squishy, I agree with the above asessments. Cut the leaf, save the plant. Use a clean, sterilized sharp blade (razor or Xacto), cut well outside the soft area and in healthy firm leaf tissue.
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    Hi guys, thanks a lot - cut the edge and cinnamoned it, he seems much happier now! hahaha
    Still wonder what exactly happened there but oh well, will be EVEN more careful about cold water and all that. Orchids are really not as complicated as I expected from all my friend's crying over them so yey!

    Weather here had gone from REALLY sunny and hot to cold and rain for a few days (welcome to Vancouver right?) so I'm guessing that had something to do with it... so continues my love/hate relationship with this massive south window - ALL THE GROWING THINGS but free indoor climate change at its finest.
    PS don't worry, no plant children except my roomie's succulents are in firing (sometimes literally) range of that window!
    Thanks again everyone.

  9. #9
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    Hello again - the edge where I cut it has started going black and moving down the leaf... I've cut it AGAIN, but if it's moving down like that what do I do? Should I try and cut the leaf all the way back or is there some way to instantly seal the edge?
    Thanks.

  10. #10
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    We recommend that you wet the leaf after a cut with clean water and then apply ground cinnamon along the cut edge. Also recommended for any cut above ground (not recommended for roots) to seal the wound.

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