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  • 2 Post By catasetum-ian
  • 1 Post By catasetum-ian

cercospora infection - silent killer

This is a discussion on cercospora infection - silent killer within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; it is always a happy and joyous moment when we receive the parcel of orchids. ...

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  1. #1
    catasetum-ian's Avatar
    catasetum-ian is offline apprentice
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    Default cercospora infection - silent killer

    it is always a happy and joyous moment when we receive the parcel of orchids. but even buying dormant bare catasetum bulbs may carry some risk. below is a pic of the bulbs when they arrived. externally they looked healthy but i always make it a habit to inspect the bulb with scrutiny.it is like searching for an escaped fugitive and no rocks shall be left un-turn. and every inch of the bulb will be examine and the bases are cut slightly to check the internal condition. all black spots shall be removed superficially to inspect the inner side, and if the discolored area runs deep inside. then all infected tissue should be removed.


    often, it is rewarding to take such tedious and meticulous effort for any residual or source of infection in the bulb that is hiding inside is not only harmful to its own survival but also poses a major threat to other orchids in the existing collection.

    and here is what i meant........
    this bulb in the second pic is from the upper left corner of above 1st picture, notice the discolored brown blotch? well, if my memory serves me correctly, it is a cercospora infection.

    it is easier for a new growth to thrive with all the infected area removed and treated rather than to leave the foci of infection inside. with the source of infection left inside, even with the use of systemic fungicide, the rot may continue.

    the last pic, notice all the amount of tissue dissected?? hahhaa...
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  2. #2
    coeruleo's Avatar
    coeruleo is offline Night Bloomer
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    Default

    were these multiple plants? or one plant you took apart? these are not real common here, but i have never seen someone sell just one bare bulb, there are usually a few small ones and one larger one when on sale here. this is probably a good type to use back-bulbs to grow new plants.... what does the bulb look like not that you have cut it? also, i see the roots seem to have died off, is this normal?

  3. #3
    catasetum-ian's Avatar
    catasetum-ian is offline apprentice
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    Default

    Quote Originally Posted by coeruleo View Post
    were these multiple plants? or one plant you took apart? these are not real common here, but i have never seen someone sell just one bare bulb, there are usually a few small ones and one larger one when on sale here. this is probably a good type to use back-bulbs to grow new plants.... what does the bulb look like not that you have cut it? also, i see the roots seem to have died off, is this normal?
    there are multiple plants there. most of the catasetums i purchased are in barebulb form, this is for ease of shipment, reduce transpiration stress (with heavy foliage they tend to dehydrate faster) and also minimize shipping cost.
    but the advantage is that you reduce chances of disease transmission, like spider mites under the leaves, snails hiding among the media and etc,
    usually if the bulb that i purchase has already been cut before, i will just slice of the cut surface till i see healthy tissue. in addition to that, any area at the base that is discolored or soft will be trimmed as well.
    yes, it is normal for the roots to die of when the bulbs are shipped barebulb. not an issue, in fact i will trimmed all the roots to the base of the bulb, not leaving even a milimeter behind. those redundant roots sometimes can be an issue

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