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Sudden death of Aerangis

This is a discussion on Sudden death of Aerangis within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi, I was wondering whether anybody can help me. I have, or rather had a ...

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  1. #1
    Lars.Kurth is offline Senior Member
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    Default Sudden death of Aerangis

    Hi,

    I was wondering whether anybody can help me. I have, or rather had a big specimen Aerangis distincta that is mounted, with 3 shoots the smaller ones with about 4 leaves, the large one had 9. 4 flower stalks.

    3 weeks ago suddenly the flower buds shrivelled, then the plant started shedding all its leaves, but one (getting yellow from the growing point), then the roots are drying from the growing point. At first the disease started slow, then accelerated (most of the effects visible in the picture started 3 days ago). I have had this happen once before with another Aerangis that I bought earlier in the summer. Although that happened two years ago.

    By the looks of it, I have to write off the plant. Not quite sure what this may be: could be Fusarium, which is odd as I always treat the greenhouse with Cleary's and Agri Foss such that I don't get problems with diseases in the winter.

    Any advice would be highly appreciated

    Regards
    Lars

  2. #2
    catttan's Avatar
    catttan is offline Senior Member
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    So sorry to hear about your Aerangis, Lars. I've had this happen to my vandas a number of times. I was told it was due to fungus attack from the roots up and and always start by leaves dropping. Thai growers advise using a systemic fungicide sprayed on periodically as preventive measure.They also advise that when vandaceous orchids especially, grow to a certain size, to top-cut it if it has a root or two.

  3. #3
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    Lars did you check the plant for the distinctive Fusarium ring of purple? Normally, it doesn't kill that quickly??

  4. #4
    Lars.Kurth is offline Senior Member
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    Here is a picture (rather bad, sorry): I think I can write the plant off, so I may as well cut the stem to see whether there is fusarium. Even the roots before the side-shoots are affected. If I remember correctly, the plant suddenly dropped half of its leaves last autumn, but then recovered (after my usual preventative autumn treatment with fungicides). That could indicate fusarium.

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  5. #5
    Lars.Kurth is offline Senior Member
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    OK: this one is for orchid heaven. There was some spaghnum between the wood and epiweb that has rotted and attached the stem, which was blackened all the way to almost the growing tip. Luckily this is a species I can get again.

  6. #6
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    Sorry to hear that I also got similar problem for no apparent reason suddenly my vandas and phals dropped off their leaves and when inspected got something that attacked from the roots so cant save them. As long as you get replacement that great Lars.

  7. #7
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    eorchids is offline Senior Member
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    Lars, 3 years ago I lost all my Aerangis during my holidays. Last year, my A. luteoalba var. rhodosticta, a beautiful plant with 6 spikes blooming, suddenly died, the attack begining from the roots. At home, this only occurs on adult/big plants. I think this is Fusarium.
    These genus seems to be very sensitive to fungal disease. Disease that expresses very quickly. Probably because something in the culture conditions was temporarily harmful.
    Despite these sporadic problems, I never treat against fungi.
    Sorry for yours orchids.

  8. #8
    pavel's Avatar
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    Quite frustrating when that happens. I lost an A. citrata overnight once. One day it had leaves, next day every single one fell off.


  9. #9
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    It's so nice to know i'm not the only one that has plants suddenly up and die! Not that i'm glad your plant is sick...but this explains a couple dead vanda types i'd thought I'd overwatered. (back when i still thought it was possible to overwater a vanda)

  10. #10
    paphioboy is offline Senior Member
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    Probably Pythium rather than Fusarium. Pythium grows very fast and causes damping off of plant tissue within 1-2 days.

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