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Old 11-01-2009, 03:21 PM
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Wilsonara Tigersette has more and more spots

For the past two weeks I have been watching several brown spots increase in number on my orchid's leaves. They are on both sides. Each week I've sprayed it with Physan20 but it doesn't seem to be working. It's been separated from the others, yet still receiving the same care. I do not mist my orchids and they are not taken outside. What should I do?
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Old 11-02-2009, 09:29 PM
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I have had spots that look very close if not the same as yours on two of my onc sharry babies, they are apparently caused by high light(which I believe since I haven't gotten any more spots since they came to me, and I know they don't get high light in front of my window). They don't damage anything, but they don't go away either. Is there direct sun on your plant? Is the plant looking otherwise healthy?
If they are the high light spots, they're a bit unsightly, but nothing to worry about.
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Old 11-02-2009, 09:32 PM
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I also had similar spots on a Sharry baby. I asked someone at the orchid society and they said it was perfectly normal.
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Old 11-02-2009, 10:57 PM
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I grow under lights. The light level is medium about 2000 FC. I don't believe it's strong enough to burn it. I'll place it in lower light to see if that makes a difference.
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Old 11-02-2009, 11:06 PM
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I have seen that on many oncidium type plants I don't think its anything to worry about if you have thoroughtly checked for bugs and dont see any
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Old 11-02-2009, 11:38 PM
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It's not actually burning it, it's more of a side affect from a little too much light, like freckles in the summer. I've heard that they bloom nicer when they get the higher light.
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Old 11-02-2009, 11:45 PM
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I have those spots on a couple of mine and haven't done a thing. The plants are perfectly healthy and growing nicely.
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Old 11-03-2009, 12:21 AM
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My sharry baby too. It seems as long as no direct light hits it they wont spot. I keep mine outside so am constantly chaning spots if the sun changes.
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Old 11-03-2009, 05:12 AM
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I have a oncidium that has loads of those spots from when I got it, but all it's new growth has no spots and I am not worried about it at all.
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Old 11-03-2009, 05:24 PM
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I took my oncidiums outside for the summer, and they both got the spots, but now they have beautiful blooms. A couple of hybrids (colmanara, wilsonara) also got spots, but not as many. It was clearly the light, and not a problem for the plants.
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