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Black leaf on Bulbo

This is a discussion on Black leaf on Bulbo within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; I have had this bulbo for several months, and the plant itself looks healthy & ...

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  1. #1
    Kmac's Avatar
    Kmac is offline Senior Member
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    Default Black leaf on Bulbo

    I have had this bulbo for several months, and the plant itself looks healthy & is putting out new leads. It hangs in my kitchen window & the blackened leaf is not against the window. The window faces north, but gets decent (indirect) light. It came with instructions to keep it moist/water daily. I usually water every other day, as the moss stays pretty damp.

    Anyway, I just noticed this leaf has turned black. I don't know when it started, as it was kinda hidden behind another leaf.

    The first picture shows it from the back, still on the plant. Second picture shows it after I removed it and its bulb from the plant. It has a very thin area in the middle, as if sunburned....but I really don't think that could have happened where it is. Anyway, the area around the thin spot is black and dead...but not really mushy, just dead.

    I'm hoping this isn't the start of anything bad. What do you guys think?
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  2. #2
    LJA's Avatar
    LJA
    LJA is offline OrchidTalk Tech Admin
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    Hi Kathi, that thin area looks like mesophyll cell collapse which, if not caused directly by bacteria, fungus, or sucking insects, can usually be traced to too much variance in day / night temperatures, cold drafts, or cold-water watering. Have you had a cold spell lately? In most cases it just means you need to keep a closer eye on conditions, but since you removed the leaf and bulb anyway, and the rest of the plant looks healthy, you shouldn't have any more problems. Typically (at least, from what we've seen here...) the damaging conditions can occur weeks earlier, after which the cells collapse and you get the thin areas. It seems as if the blackness afterwards occurs as a result of fertilizing--in other words, the damaged leaf can no longer adequately process salts from normal fertilizing, and it gets burned. That'll look even more drastic if you've been watering without fertilizer for a while, realize the plant hasn't been fertilized, and then give it a healthy dose one day to make up for it. The already damaged leaf can't process the salts, and burning occurs very likely along with a fungal invasion. In any case, those have just been our own observations, but check out this link for a more scientific look at things....

    LJA

  3. #3
    Kmac's Avatar
    Kmac is offline Senior Member
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    Louis--

    Thank you so much...I had never heard of that before. Yes, we had a cold spell a few weeks ago, and then it got warm again (and now its sudden cold again). And I have been fertilizing lately. Hhhm...I'll check out the link. Thanks!!!

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