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Black spots on Vanda leaves?

This is a discussion on Black spots on Vanda leaves? within the General Orchid Culture forums, part of the Orchid Culture category; My Vanda has little black spots here and there on its leaves. They look like ...

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  1. #1
    sand_tiger86's Avatar
    sand_tiger86 is offline Senior Member
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    Default Black spots on Vanda leaves?

    My Vanda has little black spots here and there on its leaves. They look like freckles almost...it's doing very well and is quite healthy otherwise. I was wondering if it's normal for some Vandas to have these little black spots? I know some Oncidium do.

  2. #2
    Susie11's Avatar
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    Don't know. As you know I am new to this alliance. I have some little purple spots on the newest leaves on my vanda -which is still going great guns by the way- and they seems harmless enough. If they spread maybe worry but I would imagine that they are harmless. Pictures would help.

  3. #3
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  4. #4
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    If the spots are raised and furry, then they're probably sooty mould, which can easily be washed off the leaves. This particular mould has absolutely no ill effect on plants apart from looking unsightly. It only feeds of the sugary droplets some orchids produce naturally along their stems and leaves, as well as on the honeydew produced by some scale insects and aphids (which I'm guessing you don't have as you'd be more concerned about these than the spots). If the spots are squishy and sunk into the leaves, then you probably have a bacterial problem and the spots will grow in diameter quite quickly. Best thing to do it to remove the offending leaves once you're sure this is the case (don't go mad and remove them just because there are a couple of small blemishes on them!) and treat the resulting wounds with an antiseptic and good airflow so that they dry and heal quickly.

    IMPORTANT! If it is a multigeneric hybrid with Ascocentrum miniatum in the background, then it's normal to find smooth dark spots on the leaves that are barely raised or not at all. This species often has "freckles" on its leaves, particularly close to the edges and transfers this trait to some of its progeny. This is also found in cattleya hybrids that have C. aclandiae and schilleriana (among others) in their background, which naturally have spots on their leaves.

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    I agree with Cathy, vandas and oncidiums often suffer from leaf spotting fungus. In my collection certain vandas seem more susceptible than others. The AOS web-site that Cathy gave the link to, has some good information but it says to cut off affected leaves and I don't agree with that. If I have vandas with a few small fungus spots, I'm not going to cut off the whole leaf. During the wet season, here in Florida, I spray a fungicide once a month and it controls most of the fungus problems. There are many fungicides available, I use a combination of Dithane 45 and Thiomil.

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    Quote Originally Posted by cdayinflorida View Post
    That's exactly what it is...looks identical! It really doesn't seem to hurt the plant at all. It's a vigorous grower, with a healthy root system so I agree with Tucker - I would never cut off a leaf simply because of this seemingly harmless fungus. If I did, I wouldn't have any leaves left as it's pretty much lightly freckled all over the place. I'll spray it down with fungicide and see where I can go from there...but it doesn't seem like too worrisome of a fungus, as far fungi go. Seems more cosmetic than anything.

  7. #7
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    Though not very harmful themselves, this infection does weaken the plant and more importantly is a sign of incorrect culture, basically not enough air movement and foliage remaining wet too long. Both these conditions are also favorable for the deadly cousins of this fungi, so it is like a warning system.

  8. #8
    sand_tiger86's Avatar
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    Quote Originally Posted by Halloamey View Post
    Though not very harmful themselves, this infection does weaken the plant and more importantly is a sign of incorrect culture, basically not enough air movement and foliage remaining wet too long. Both these conditions are also favorable for the deadly cousins of this fungi, so it is like a warning system.
    Well I have a giant industrial fan blowing on my plants all day long due to the heat, so it's not a lack of air movement. The plant actually came that way. I'll use fungicide, like I said, but I'm not going to stress too hard over it until I see true signs of weakness.

  9. #9
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    I don't cut off the leaves, either.

  10. #10
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    And, as we all know, Cathy is THE vanda queen, so if it works for her....

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