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Terrible Leaf Spot

This is a discussion on Terrible Leaf Spot within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Found this on my dendrobium leaves. No idea what it is....

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  1. #1
    orchidaddict789's Avatar
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    Default Terrible Leaf Spot

    Found this on my dendrobium leaves. No idea what it is.
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  2. #2
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    That looks like cell collapse caused by sunburn. I have never seen that kind of spot on my Dendrobium but I have seen it in few occasions on my Phals. Those spots would soon turn brown and crisp.

    Check the undeside of the leaf too, if those are not sunburn, chances are they are caused by spider mites.

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    I think Tanya is on the right track with the spider mites.... or other evil little critters. It seems too small and spotty to be sunburn.. At least in my opinion.

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    I checked all over and see no sign of mites. Maybe a passing bug decided to get a nibble on it or something. See no bugs now.

    I'm keeping an eye on it for new spots. See none so far.

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    I don't think it is spidermite damage the area is not full of little pits over a wider area . I had something like that . I was cleaning a window and got some of the cleaner on a leaf .
    It could be slug or snail damage ? If dry and not spreading would not worry . Gin

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    Its not slug or snail damage thats for sure those buggers will put a hole in the leaf. Slugs will eat in the center and cattapillers will start on the edges. Roaches will leave a jagged apearance on the edges. I had a problem with slugs They seem to love Phal leaves.

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    I forgot to mention I think that looks like mite damage.

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    Bump
    Does anyone have any further information on this condition? I have a few 'chids and some other plants showing this same thing. Is it cell collapse or mites? If cell collapse what is the cause and what to do? Thanks.

    Tami

  9. #9
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    I see two problems. Wrinkled or pleated leaves are caused by a lack of moisture reaching the vegetative part of the plant. This can be caused by not watering enough, or watering too much. Increase the frequency of watering if the roots are white or tan, firm, and spread throughout the mix. One is overwatering if the roots are down to the wire, black, brown and mushy. Trim the dead roots off, repot into a new mix, and decrease the frequency of watering. Overwatering will also cause leaf cells to fill with water forming a blister which does not appear on both sides of the leaf. The blister cannot be scraped off.
    Brown and back patches may be due to a bacterial or fungal infection. The resulting leaf rot appears first as a slight discoloration of the leaf. The yellow spots gradually turn black or brown. The spot has an irregular border. Left alone, the spot gets larger. Typically, the infected part eventually turns grayish and becomes soft in texture. I believe leaves like the one in the picture that are heavily covered in rot should be completely removed. One should cut the leaf back to the healthy tissue. You can spread the disease to other plants with the tool you use to remove the infected leaves. Treat the good edge of the leaf with a bactericidal solution. Another kind of treatment for this problem is to use a bactericide/fungicide spray. The spots should dry up and turn brown within a week to 10 days after spraying. You have to keep repeating the treatment if there are still signs of new rot, if the spots are still increasing in size or in number.

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    Thanks, Joe. The spots on my leaves don't turn brown or mushy, they just get so thin you can almost see through the leaf. Roots are good and the spots don't seem to grow larger, they just looke like a patch of leaf skeleton. I have them on some oncs, a ryn, a corn plant.
    Thanks,
    Tami

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