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Dendrobium yellow leaf pattern

This is a discussion on Dendrobium yellow leaf pattern within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi guys! I need some advice from the experts here. I have a couple of ...

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  1. #1
    gabi_borza's Avatar
    gabi_borza is offline Senior Member
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    Default Dendrobium yellow leaf pattern

    Hi guys! I need some advice from the experts here. I have a couple of dendrobium keikies from july of last year. This year, back in february-march, the leaves developed some kind of yellow spots, within about a month or so. Since then the spots didn't develop further, didn't progress, didn't regress. The new pseudobulbs are ok, no spots on them. Only the old ones, from last year. Any ideea what this could be?
    Here are some pictures. There are some sunburn spots, which they got because I moved them outside a couple of months ago, under full sun.Name:  DSC08633.JPG
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  2. #2
    gabi_borza's Avatar
    gabi_borza is offline Senior Member
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    I see that no one can give me an answer. Could this be from the medium staying too dry? Or from the lack of fertilizer?

  3. #3
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    Hmm the yellow spots look sunken...could be mesophyll cell collapse. Was your plant exposed to cold temps? And also, do you see any pests? Good thing they're not spreading, and the new growths look healthy, so I wouldn't worry too much about it.

  4. #4
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    catttan is offline Senior Member
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    Have you checked the underside of the leaves? Could be the work of spider mites.

  5. #5
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    wetfeet101b is offline It's not dead! It's just permanently dormant.
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    How old is that cane with the yellowing leaves in relation to the entire plant?

  6. #6
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    My first instinct if i spotted this on any leaves of my plants would be red/false spider mite and near heart failure. My worst enemy!!!!!!!!!!!!!!!!!!!!!!! There does not always have to be fine webbing on the undersides. Treat asap and quarantine until you or someone can confirm. Have had one minor infestation early this year on a newly purchased cymbid. Everthing got treated with Forbid4F mticide and never had any repeats or further probs. The cymbid got bagged and is flourishing now. and the underside of every single leaf of evry plant is misted daily.

  7. #7
    gabi_borza's Avatar
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    Thanks for your replies! The older canes are 1 year old, I got them in july last year, as keikies, from a friend of mine. There are no parasites on them, I am super carefull about that. I had spider mites on my cymbidium last year, but I got rid of them with rubbing alcohol and frequent showers. I don't know if the temps are too low, the lowest temps were 47 F.

  8. #8
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    Hi Borza! As you are obviously familar with the little critters (mites) as I am And you implement measures offensive and unsuitable to them I think they have been and gone. Dendros can tolerate cooler temps aslong as its not sudden or draughty. I do not think it is fertilizer or water related. Have had a good study and see no other problem than existing mite damage. I hate those things with a passion and cannot even tolerate the sight of the scarred tissue they leave behind. I do believe you have nothing to worry about other than the fact it is just scars after a short invasion of whatever kind of mite it was that left as soon as it arrived. They hate cool and humidity.

  9. #9
    gabi_borza's Avatar
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    Thanks Matt! I'll keep an eye on them, and as the spots are not spreading, I think I will just let them be for now. Hope to see some flowers this year!

  10. #10
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    Brutal_Dreamer is offline Dreaming with my eyes open...
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    Quote Originally Posted by gabi_borza View Post
    Thanks Matt! I'll keep an eye on them, and as the spots are not spreading, I think I will just let them be for now. Hope to see some flowers this year!
    Keep us posted on how this goes. Hope you get blooms soon.

    cheers,
    BD

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