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Strange Leaf Spots

This is a discussion on Strange Leaf Spots within the General Orchid Culture forums, part of the Orchid Culture category; Originally Posted by lja Hmmm. I just don't know, then. None of the markings I ...

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  1. #11
    Tanya's Avatar
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    Quote Originally Posted by lja
    Hmmm. I just don't know, then. None of the markings I can see on the leaves look like anything I would be worried about personally, and if you hadn't said anything about leaf or spike deformities, from the pictures, it looks like a perfectly healthy plant! The spots sure don't look like any virused plant spots I've ever seen. Usually when leaves are stunted or deformed, it means there's been some kind of disruption in the root system, typically by under or over watering. So I'm stumped!
    There seem to be no apparent deformities until the bloom appeared in winter. So we'll have to wait and see how they turn up now that the plant is in a "better" living condition. Fresh air, humidity and all that.

  2. #12
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    I see nothing stunted on my plant. Now it's blooming three spikes and as far as I can see, the flowers are perfectly formed.

    Not necessarily; that's the frustrating part. A strong plant like that can keep looking really healthy for quite a while before a virus slowly degenerates it. That said though, I'd almost be willing to bet that those spots are not virus--the patterning in them just sets my inner alarms going and I start getting nervous. But if they're not spreading, like Jason said, no worries. And kewpie may be totally right on as far as an ID.
    About the spots--I cut the spots out and did a little "experiment" with the biggest one. I used sharp scissors to cut the spotted portion of the leaf into several smaller pieces. Then I inspected the "inside" of the leaf (the inside leaf tissue, aka the cross-section) and guess what? They were green. Well, mostly green (except for a little bit of brown). That really surprised me, because I expected the inside of the leaf to be brown. For some reason, the discolored spots seem to be more like on the leaf surface...like this:

    Cross-section view of leaf:

    ************ leaf surface (top)
    ************ inside of leaf
    ************ inside of leaf
    ************leaf surface (bottom)

    I don't know if this is of any significance...but should a virus (or even a fungus) cause discoloration all the way through the leaf, not only on the surface?

    I'm not trying to make things complicated and confusing, but this "discovery" just got me more stumped . For now, I'll keep a close eye and see if it spreads. Hopefully not...

    ...also, thanks for all the help, everyone!

  3. #13
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    And one more problem...this happened before...when I cut part of a leaf off, the cut edges start getting brown. Then the brown continues to move inward for about 1/4 inch. So I end up with a brownish margin on the leaf. This gets me worried because I get afraid that the brown will continue creeping up the leaf at a slow rate ...

    I do sterilize the cutting instrument (soaking them with bleach/rubbing alcohol). I don't know, is this normal?

    I cut out the spots and watching the leaves closely.

  4. #14
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    since that brown is spreading so quickly, maybe you should just cut off the entire pseudobulb? im sure you know already, but make sure to use a new razor blade. i would use a blow torch and heat the blade so that when you cut, you cauterize at the same time. plus, it give you an excuse to play with fire.

    your plant looks really healthy, and it probably wont miss the one growth. i think that losing the one pb is better than possibly losing the plant.

  5. #15
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    So basically I cut away a leaf tip and the cut edge got brown. The brown is just around the cut edge of the leaf, meaning it hasn't reached the bulb , so I guess I'll just cut away the brown portion. Hopefully that'll do the trick! But thanks, Kewpie, I'll keep in mind that's it's better to sacrifice one PB than the entire plant!

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