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Funky, damaged leaf, Aerangis articulata

This is a discussion on Funky, damaged leaf, Aerangis articulata within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Victoria, It happens outside, too. You can have all the right parameters in place and ...

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  1. #11
    cdayinflorida's Avatar
    cdayinflorida is offline Senior Member
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    Victoria, It happens outside, too. You can have all the right parameters in place and you still can get rot. When you mist...just make sure they are pretty dry before the cool of the evening. If you notice water accumulation in the crown...just tip it over and let the water run out on a tray.
    Don't get to frustrated...it happens. We've all had it at one time or another.
    Are you able to take them outside to spray? I would recommend a good systemic fungicide(s) I make a cocktail of sorts rotating three different kinds. If you need help just ask...I will give you the directions on what I use and how often.

  2. #12
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    I could get them outside, yeah. I can't leave them out, at least not for a whole day (if any of this is stuff that needs to dry/dissipate and should be kept outdoors) -- I have a 3rd-floor apartment with a balcony, but the balcony's totally unshaded. I keep saying I'm going to get an umbrella for out there and keep not doing it. I would love to hear any suggestions, though! PM me if you want, so we're not basically taking up RVO's forum with brand-name advertising.

    I'm only hitting 50% with angraecoids so far -- I have two growing fine, one that didn't make it a month, and now this poor little one. People keep telling me they're easy growers, but I'm not convinced. This one might be stabilized, though -- the other leaves have stayed just as they were, no further worsening, so maybe it'll recover after a while. I so want it to. The pictures of the blooms are great! Cascades of bright white stars.

  3. #13
    orcoholic is offline Senior Member
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    In my experience, Aerangis like low light, good water and mounting. Angraecum don't need to be mounted and like more light - sometimes lots of light. Doesn't sound like your balcony will work for the Aerangis. The umbrella idea is a good one if you can keep it from blowing over.

  4. #14
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    My balcony isn't really suited for orchids staying outside at all -- we only get about 4 or 5 months when it's warm enough, and those months, we get a *lot* of rain and not enough sun to dry it up fast. I'm told we're technically a swamp biome, but don't get the heat or sun or a long enough growing season to support tropical plants outside. And then most summers we get about two weeks running where it's just blazing sun without any rain at all. Not even a great climate for regular plants in pots, although I do what I can. It's a nice place to be a human who likes cool, cloudy weather, though.

    As an update on this plant, the top leaf that looked so bad went, and over a couple weeks, the next one didn't look infected but the base got brown and dry until it was almost detached anyway, so I took it off. The other two are holding on without any change so far, but even if it's stabilized, I imagine it will be months before it starts growing again.

  5. #15
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    Quote Originally Posted by orcoholic View Post
    It sounds like your Aer has crown rot (a Bacterial rot). I believe it's happened because water stayed in the crown (where the leaves meet) too long. It can be caused by watering too late at night or (and I think this is your problem) misting too heavily and or too often.

    Contrary to popular opinion, orchids should never be misted, unless it's to cool them - and then only if there is more than enough time for the water to totally evaporate before the temperature goes down at night. The benefits from misting are at best temporary - a brief rise in humidity. The problems are numerous, including what happened to yours. Anytime water sits on any plant there is a chance for bacteria or fungus to gain a foothold and begin to do their nasty jobs.

    In the wild, Aerangis, Phals, and almost all other orchids sit on a tree with their leaves parallel to the tree. This prevents water from accumulating in the crown and makes the water slide off the leaves (gravity). There's an important reason for this. Water that stays on leaves is not good. In fact it's bad, bad, bad. When we pot orchids, the leaves are parallel to the ground and the potting medium, causing water to stay on the leaves and to run towards the crown. Bad, bad, bad.

    Crown rot is unfortunately a death certificate, unless the orchid produces a new growth or basal keiki which is possible in Aer.

    Aer do much better mounted because of the tenderness of the leaves. You should also spray the rest of your collection with a fungicide/bacteriacide like Physan at the recommended strength. Too little no good, too much probably worse.

    Phal bellina and gigantea should also be mounted because they have the same tendency to rot because their leaves are very tender - especially when young. If mounting is impossible, tilt the pots as much as possible to help the water runoff and keep if from accumulating in the crown. Also, increase air circulation and never water late in the day....and remember, grasshopper, NO MISTING!!!!!!
    huh, funny thing eh? I mist every day, and i have NEVER had a problem. Maybe its just your particular methods? The only orchid i have had a problem with was my Gongora, but thats sorted now. And you want to be VERY careful using ~icides at full strength on orchids, as some can cause some serious side effects. I use Liquid Sulphur (its all organic ) at half the recommended strength for fungal complaints and then i use an insecticide called Confidor spray again, at half recommended strength. To make sure im not going to cause any buildups of anything, i always use a Truncheon stick to measure the PPM value of the mixture. Too high (i think over 7 on the stick(7,000 ppm or 700,000 ppm, cant quite remember)) and i water it down, or too low (anywhere below 4 on the stick(4000 ppm or 400,000 ppm)) i then add a couple of drops till its up around 5/6.

    (the truncheon measures with single digit numbers, and im so accustomed to reading them, i forget whether the ppm is measured in thousands or hundreds of thousands-i will check it up hehe)

  6. #16
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    Yeah. . . plants are living creatures. They'll respond to their environments, and different people have different environments. So. I don't think there can be a lot of 100% hard-and-fast cultural rules. People come on these boards regularly claiming they can't grow orchids in [insert medium here], and then half a dozen people will say that's the only medium they use.

    The plant seems to have stabilized without any further problems, no dehydration or other bad signs, and I'm cautiously hopeful that it'll start growing again in a few months. Cross fingers with me!

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