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Phrag with pitted leaf

This is a discussion on Phrag with pitted leaf within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; This is my Phrag Schroderae, won at an OS raffle a few months ago, so ...

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  1. #1
    Cinderella is offline Senior Member
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    Default Phrag with pitted leaf

    This is my Phrag Schroderae, won at an OS raffle a few months ago, so I know nothing of it's culture before I had it. It has brown pitting on this leaf and it is on the new growth. I ran a tissue over the pitting and nothing came off so I guess it is not spider mites. I don't know what this pitting could be. Please help!
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  2. #2
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    Many times it's big temp drops or a colder environment than the plant likes that cause the cell collapse or pitting in Phrags and Paphs.

    I don't live in spider mite country and have only seen damage done in other GH on other genera but that does not look like spidermite damage.

  3. #3
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    I have seen that kind of damage on some of my orchids that are exposed to cold weather outdoors. Most of the time the damage wont spread (but most of them are vanda type) but maybe its not so for plants with softer leaves. Just keep an eye on it and cut off the damage part if it shows sign of spreading.

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    This is grown indoors under lights so it could not have gotten cold at all....it is next to a window (with a storm window on it) but a foot away and when the temps at night go into the 20s I draw the shade. ???

    Should I cut the damage off or just watch it?

  5. #5
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    not sure what it is. I see it occasionally and am inclined to leave it alone unless it starts spreading rapidly. sometimes an old leaf that is about to fall off (and from which the plant is reabsorbing nutrients/water) will do crazy things. I have a paph whose old leaves turn this necrotic shade of brown that make you think it's pseudomonas...

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    Cinderella is offline Senior Member
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    But this leaf is on the new growth....which makes it even more strange.

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    I have this on Phragenstein , i thought it was over fert problem.
    Mainly the older leaves but there is a little on the new growths.
    Doesn,t seem to cause the plant any real harm so i,m not concerned
    for the moent.

  8. #8
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    That's cell collapse / tissue damage, and is extremely common. I have no idea what causes it to happen, but have seen it on a lot of Paphs as well. Mike may be right in terms of the plant having gone through a cold snap, but I can't confirm that--good to watch out for, though. The sunken areas are a lot more prone to sunburn, which is why they turn brown when exposed to a lot of light. I've never had it be a problem in terms of spreading like an infection might, and most growers I know just live with it. Wish I knew for certain what the cause was, but it's definitely not mite or insect related. I wouldn't cut it off at the moment, since the areas are more of an "eyesore" at this point than anything else. I'd just keep an eye out, and maybe reduce the light level some so they don't keep turning brown.

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    Hmmm.....it is under the florescents, but at the end of the bulbs. Still reduce the light?

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    If you don't want the pitted areas to be brown, you'll have to. But that to me would be a very secondary issue. Grow the plant under the light it needs to thrive, and never mind a little leaf scarring. Really, there's nothing wrong with the plant just because it has a few of those sunken areas. They'll turn brown under strong light, but there's nothing you'll be able to do about that--except reduce the light.

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