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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; There are a few of these leaf spots on my miltassia. Each spot is about ...

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  1. #1
    orchidaddict789's Avatar
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    Default Strange Leaf Spots

    There are a few of these leaf spots on my miltassia. Each spot is about the size of a nickel. What's weird is that there are "patterns" inside the spots. This picture shows the same spot on the both the top and the bottom of one leaf.

    Any ideas what this is? Anything serious?

    Hopefully it's nothing so serious that it's deadly...
    Thanks for any help!
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  2. #2
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    looks like Rust &/or cercospora fungus (according to the picture here ).

    your spots look to be exactly the same as those in the 1st picture.

  3. #3
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    if it's not spreading, i wouldn't worry too much about it. if it is spreading...

  4. #4
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    It's the patterning inside the spots that's worrisome to me. I equate patterned spots with viruses, but that may just be due to my own limited knowledge. I wish we could get a plant virology expert on here. In the meantime Lily, I would spray the plant with disease control of some kind, maybe even cut off as much of the leaf as necessary to get rid of the spots.

  5. #5
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    Thanks for the help, everyone!

    No, it's not spreading. I've noticed about three of these spots so far on the plant, but have kept an eye on it for the past few weeks but have seen nothing new. (At first I thought it was just some regular old aging spots but later it became apparent that these spots didn't look right.)


    I hope it's not a virus. Even a fungus is better than a virus, because at least fungus has a chance of being cured. Is it true that virused plants show slow (stunted) growth and overall don't look healthy? My plant is a great big plant that's growing a lot...picture (not showing spots) below...

    I'm going to cut it off and treat it now...
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  6. #6
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    Quote Originally Posted by orchidaddict789
    Is it true that virused plants show slow (stunted) growth and overall don't look healthy?

    ...
    I have a phal that I think its virused. Its growing vigorously and throwing basal keikis every year. Sometimes, yellowish spots appeared on the leaves, it does not spread, and it does not grow bigger. The weird thing is, the spots disappear after few weeks. The thing that made me think that this phal have virus is sometimes it produce a leaf that is stunted. And everytime it blooms (this will be its 3rd blooming) some of the flowers are also stunted,i.e. no petals and no lips,and some open prematurely. In the case of the mother plant, only half of the buds will develop into full flower.

    The pics attached shows one of the stunted leaf, the other leaf with the yellow spot and the bent spike on the first keiki. I accidentally broke the spike on the mother plant but its now growing another one, so we'll see how that one will develop. The second basal keiki, as you can see appeared to be healthy. I think this baby will give its first spike next year. There is another keiki on the way.

    BTW, none of my other orchids show the same weird characteristics.
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  7. #7
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    Is it true that virused plants show slow (stunted) growth and overall don't look healthy?
    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.

  8. #8
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    Tanya, your plant has a ton of aerial roots. If most of the root system is aerial like that and the plant's leaves are stunted, you're not watering the plant often enough or providing enough humidity. Phals really grow best when they're given an even amount of moisture on a regular basis. I think if you watered more you'd see the new leaves growing out to their proper size, and the spikes and buds developing to their full potential. I don't think you need to worry about virus quite yet!

  9. #9
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    Lja, this phal is growing outside together with the p shilleriana and it gets more than enough water during rainy season, that stunted leaf appeared during the wet season. The plant is mounted on a section of bamboo and the bamboo cavity is full of roots. They stay moist and I don't have to water as often as some of my orchids. Maybe its not virus. I am also curious as to how the flowers develop this year, now that the plant is no longer in the same room with the smoking DH (before we moved to our present home, this plant was growing indoors right above DH ash tray) Wasn't there a discussion about TMV on another thread? Although I doubt that its TMV, maybe its the smoke that causes all those stunted blooms. We'll see how the flowers turned up this year.

    An update on the second keiki, I just found out its growing its first spike, one skinny spike about half and inch long at present.

  10. #10
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    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!

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