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  • 3 Post By catttan

Please help with my dendrobium ailment!

This is a discussion on Please help with my dendrobium ailment! within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; I just found a dark spot on a leaf of my dendrobium. I also found ...

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  1. #1
    moniluhum is offline Senior Member
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    Default Please help with my dendrobium ailment!

    I just found a dark spot on a leaf of my dendrobium. I also found a dark area at the base of another leaf. Can some please tell me if this is a fungal infection and if so what to use. I'm freaking out here!

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  2. #2
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    More like sun burn - caused by water droplets acting like mini magnifying glass. Any way no harm applying fungicide, just in case.

  3. #3
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    Brutal_Dreamer is offline Dreaming with my eyes open...
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    Quote Originally Posted by catttan View Post
    More like sun burn - caused by water droplets acting like mini magnifying glass. Any way no harm applying fungicide, just in case.
    I agree. Nothing much going on out of normal to my eye. I would follow Yew Sungs advice and spray a preventive fungicide and increase air movement to be certain but I would guess sun damage.

    cheers,
    BD

  4. #4
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    I agree with both Dreamer and Catttan just monitor to make sure it doesn't spread otherwise, yep sun damage.

  5. #5
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    Is this the same issue? Dendrobium anosmum. My black spots look worse than those above, but based on where the plant is hanging (it is mounted on cork) sun damage could be a possibility, I guess. In summer (Northwest Florida) it was hanging under a covered patio roof. Now that it's been moved indoors, it is in a Florida Room with fairly bright light from a south window. A couple of the leaves turned completely yellow and fell off. I've only had this a few months and don't know what to expect. Deciduous? Most of the canes are firm and green but a couple of the canes have shriveled slightly on the tips.

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  6. #6
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    Quote Originally Posted by FLNewbie View Post
    Is this the same issue? Dendrobium anosmum. My black spots look worse than those above, but based on where the plant is hanging (it is mounted on cork) sun damage could be a possibility, I guess. In summer (Northwest Florida) it was hanging under a covered patio roof. Now that it's been moved indoors, it is in a Florida Room with fairly bright light from a south window. A couple of the leaves turned completely yellow and fell off. I've only had this a few months and don't know what to expect. Deciduous? Most of the canes are firm and green but a couple of the canes have shriveled slightly on the tips.
    Dendrobium anosmum is a deciduous plant, the mottled spotting that you show looks more like spider mite damage to me. Notice that it is on the bottoms of the leaves and looks pitted. I have noticed that my deciduous Dendrobiums tend to get all sorts of leaf problems right before the leaves fall off, so you may not need to worry too much. If you can get a loupe or something and see live mites wandering around, I would suggest you do something about them though.

  7. #7
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    Dends can get a purplish tinge, a reaction to a possible over exposure to light. But I can be wrong, have you tried to apply Physan? Its a systemic fungicide. Its application can only help and rule out any fungal issues, if any.

  8. #8
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    Have you had any drastic change of weather unlike the usual change from spring to fall to winter? This can often cause the shriveling tips. As for the pitted spots If they are spider mites you would notice them. They usually group and literally look like mini spiders. Not all of plants will show signs of "webbing" so look closely for red spots (the insect). If not mites and the problem spreads, then its rot. Just cut out the rot and it should stop the spread. One misconseption is that only roots suffer this ailment. But the pitting look alone doesn't mean it may not still be sun damage, just that it is more concentrated on.

  9. #9
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    Thank you for all the advice. There was significant weather change here as we went into the fall. Cold weather very early so the plants came inside where it is not as humid. however, it was much warmer indoors in the sun room than it had been outdoors. I tried to compensate for the change by watering this more often, by which I mean I hung it in the shower a couple of times a week (instead of once a week) and drenched it. It's a fairly large hanging plant mounted on a slab of cork and most of the plant looks vigorous and bright green. The damage is just on 6 leaves (so far). I tend to think it's fungal and will try the Physan.

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