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Trouble with Vanda Zengyo white spike

This is a discussion on Trouble with Vanda Zengyo white spike within the New Growers: Ask the Senior Members forums, part of the New Growers category; Satish, I would agree with everyone, the problem definitely is low humidity and i also ...

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  1. #11
    Halloamey's Avatar
    Halloamey is offline Senior Member
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    Satish, I would agree with everyone, the problem definitely is low humidity and i also suspect less sunlight in the former case whereas too much exposure in the latter. For Vandas I would suggest an east or west site. East is better, with the western exposure the plants become think and leggy whereas with the eastern exposure they are plumper and compact. Many Catts and Vandaeceous will simply not flower when there is not sufficient light. Another culprit which most have missed is temperature. I have faced similar problems with nobile dendros. In winter the temperature goes down, enough to initiate inflorescence formation, but come feb, march the temperatures plummet into the 30s and then the buds blast. Search what parentage your hybrid has, this could help you in deciding.

  2. #12
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    Another point that I forgot is water, some Vanda hybrids though do not a complete rest, benefit from stressing the plant a bit, let the relative humidity be high, but do not water the plant directly, that may help, this has helped me with some dendros and aerides.

  3. #13
    blrnut is offline Senior Member
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    Thanks, Randy. In my over excitement to get it to spike, I must have left the V. Roberts Delight 'black' in too much sun. I'll move it back so that it is not directly exposed to sun.

    Amey: I am not sure humidity is the problem. Especially with the last couple of months of monsoon rains, the humidity was on a regular basis hitting 70s during the day and >90s at night. I have other plants like ferns, anthuriums, creepers (including a patch of grass) below my orchids to keep the humidity higher (especially in the summer). Also, this vanda has never given me any trouble for lack of water. It was very quick to take off and none of the roots ever have had dead tips after I got this plant about 10 months back. Most of the roots have active growing tips. Interesting thing is, this is one of the only two Vandas which has active root tips in light green color (also, these roots curiously try to grow up towards the plant rather than hang!). the rest have brown active tips.

    I might have to try your other solution, where in I reduce the watering. I have tried to give it a 'shock' to induce buds by keeping it in direct morning sun, but does not seem to work. The plant has decided to start a new spike (fourth one now), since looks like the spike in the picture is slowly beginning to turn brown (from the base)

  4. #14
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    BTW, as I mentioned earlier, this is its 5th month since the spike in the picture has showed up. Before to it, there were 2 more spikes, which turned brown

  5. #15
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    I had a vanda that did that several times...so I gave it to a friend that loves Vandas and has much more patience than I do. I struggle with the vandas' and am hoping that the new misting routine will help them flourish.

  6. #16
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    BTW, I forgot to mention another subtle info. This vanda is having a basal keiki about 2-3 inches long (if you see the full image, you can see that couple of short leaves popping out from the right side, very close to the basket and the mother plant).

  7. #17
    blrnut is offline Senior Member
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    Whew! Looks like finally the V.Zengyo White has decided to bloom. The spike has started to show its first bud formation. This will be the first bloom for this plant. Did not change any thing, but looks like 5th time was lucky! Yes, 4 previous spikes turned brown. hmm.. might need to feed it heavily after the bloom as it has only couple more nodes to spike from next time on.

    I am very excited as there are couple more vandas in spike for the first time!

  8. #18
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    congratulations satish, finally its rewarding you for your patience.

  9. #19
    tropidolaemus is offline Junior Member
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    That does look like burns on the foliage to me as well. But just to throw my $0.02 in the ring, I have a couple Vandas hat would start to spike but then the spikes would brown and die off. The end result was that they were suffering a fungal attack. I don't like "chemicals" so I treat with a neem oil solution whenever I see signs or on the 2 that seem most susceptible whenever they start to spike. Neem is good on some pests and fungus or bacterial infections and will not harm the plants. I have never had a problem even when directly spraying the spikes themselves!

  10. #20
    IslandLiving is offline Junior Member
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    At our nursery, we regularly come across vanda that have spike aborts. Its is something we look for when we take cuttings for our new rows.

    Ive been given the explanation that one's that are "weaker" in some way will tend to have more aborts than others. I would say that 90% throw healthy spikes somewhere in their life regardless of how many early aborts there are though. We of course only select the ones with 2 or less aborts lets say per 10 ok ones to take cuttings from.

    Although there could be humidity,pest,water problems ect, if youre not seeing other obvious signs, it sounds like its on its way.

    The other one, if you havent removed it from others, i would do so. The larger spots could very well be sunburn or chem-fertilizer burn but has clearly progressed to something else. The small dark spots with lighter 'halos' around them however dont resemble any burn ive seen. Fungal's my guess.

    I think ive seen daconil sold at boxstore. I only purchase from my chem suppliers so not sure what if any difference there is. We use daconil here, broad spectrum fungicide. If you do use it, not in full sun, try to stay away from the root tips. Either way ive seen no phytotoxicity in any way to our dens, catts or vanda from daconil.

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