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Psychopsis Mendenhall 'Hildos' leaf problem

This is a discussion on Psychopsis Mendenhall 'Hildos' leaf problem within the General Orchid Culture forums, part of the Orchid Culture category; Oh no, Amey! Just when I was feeling more relaxed that it might just be ...

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  1. #11
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    Oh no, Amey! Just when I was feeling more relaxed that it might just be natural leaf shed.

    Tell me more, please...what should I do? What systemic fungicide would you use? Jason uses Bayer Rose and Flower Disease Protection...what about you?

    I'll do what you suggest about air movement. There's a lot of good circulation in my greenhouse, but this particular plant may not be in the best area to get a nice enough breeze. I need to check.

    What do you think about the potting media? This has been bothering me a bit..sorta nagging at me. I repotted it last year in the same as before that....mostly coco nuggets, a little bark and maybe a bit of charcoal (I failed to make a note). Do you think I should unpot it easily, disturbing it as little a poss., and check? Possibly add a bit more inert media?

    Thanks for your help,
    Vicki



    Quote Originally Posted by Halloamey View Post
    Nope, it is not a naturally shed leaf, it is a classic example of rot followed leaf shedding. If it was natural shedding the direction of browning would have been exactly the opposite from the leaf tip and not the base. I think the pseudobulbs have stayed wet for too long. Use a systemic fungicide and increase the air movement or slowly the plant will loose all the leaves.

  2. #12
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    Vicki do not panic. I use a systemic with a core ingredient called carbendazim and Hexaconazole. I do not know the brand names for the same chemicals in the US. You can look at Physan, I understand is the systemic of choice in the US. First of all, I would just remove the top layer of coco nut husk chips, they retain too much moisture and dry out slowly, make sure that the pseudobulb bases stay clear of the media. Repotting at this moment can be a problem if the root system is already stressed, I would recommend that you modify culture rather than repot. Water less sparingly, make sure that the foliage doesn't stay wet for long. Make sure it gets plenty of warm air around it. This together with the systemic should take care of the problem.

  3. #13
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    Default Halloamey

    Amey, I just walked out to my greenhouse to remove the top layer of coco chips and when I did, I saw that the roots were exposed and dead, as well. I don't know how far down they are not living, but of course, I would have to unpot to see. By the way, the pbulbs are hard but the one with the yellowing leaf is maybe a slight bit less hard near the media.

    Also, I was able to get a different photo since the sunlight was better than it was at the time of my initial photos.

    Lastly, I haven't had time to look much yet, but so far I haven't found a U.S. brand of fungicide that contains the ingredients you use.




    Quote Originally Posted by Halloamey View Post
    Vicki do not panic. I use a systemic with a core ingredient called carbendazim and Hexaconazole. I do not know the brand names for the same chemicals in the US. You can look at Physan, I understand is the systemic of choice in the US. First of all, I would just remove the top layer of coco nut husk chips, they retain too much moisture and dry out slowly, make sure that the pseudobulb bases stay clear of the media. Repotting at this moment can be a problem if the root system is already stressed, I would recommend that you modify culture rather than repot. Water less sparingly, make sure that the foliage doesn't stay wet for long. Make sure it gets plenty of warm air around it. This together with the systemic should take care of the problem.
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  4. #14
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    The one with the yellow leaf looks like it is rotting. I would unpot and check out the roots all the way through and then go from there. You have nothing to lose at this point. I keep mine in moisture retaining mix but do not have very high humidity where I am at.

  5. #15
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    Default Daethen and Hallomey

    After I removed the top layer of coco nuggets mix and found dead roots, I continued down to see how far below before live roots began....and they didn't begin. There were no live roots at all under the old pbulbs, so about half of the plant has no live roots. By the way, as I was checking the roots, the yellowing leaf on the old pbulb fell off. The roots on the opposite side of the plant are ok, but not excellent. I see no other option than to totally repot. More photos for you to see. Looking at them may make more sense than me. Any thoughts?

    Thank you for helping me


    Quote Originally Posted by Daethen View Post
    The one with the yellow leaf looks like it is rotting. I would unpot and check out the roots all the way through and then go from there. You have nothing to lose at this point. I keep mine in moisture retaining mix but do not have very high humidity where I am at.
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    I would do a total repot. Get rid of the dead roots and possibly the one or two pbulbs that look yellow and possibly mushy. Plant it with the new growths in the center of the pot. I'm not sure what to tell you to use for potting medium as I do not have your conditions. I mixed small bark, some sphag and chc for mine.

  7. #17
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    Default Daethen

    I'm gonna start on it 1st thing in the morn.
    Thanks for your help, Jonada...
    Vicki

    Quote Originally Posted by Daethen View Post
    I would do a total repot. Get rid of the dead roots and possibly the one or two pbulbs that look yellow and possibly mushy. Plant it with the new growths in the center of the pot. I'm not sure what to tell you to use for potting medium as I do not have your conditions. I mixed small bark, some sphag and chc for mine.

  8. #18
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    When I received my Psychopsis in post, 4 of them were young plugs and they looked exactly like yours in the picture, bone dry roots. I planted all of them in SH and in the matter of a month, they started to grow out roots. They are happy now. It is said they don't like the re-potting regime but its got to be done and in my opinion they are not as delicate as they myth goes around. I am sure this one will grow out as a strong one again.

  9. #19
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    There are plenty of roots on that orchid for it to survive. I would repot and make sure you have good air movement so that it doesn't get fungus again.

    cheers,
    BD

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    I agree that they are not as delicate as rumor suggests. I have had no real blips when I repot. And Bruce is right, there are plenty of roots to go on.

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