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  • 1 Post By Kmac
  • 1 Post By ang709
  • 2 Post By panam

Rossioglossum Grande Leaf Problem

This is a discussion on Rossioglossum Grande Leaf Problem within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi all! I am hoping some one can give advice on a Rossioglossum Grande with ...

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  1. #1
    orchidsal's Avatar
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    Smile Rossioglossum Grande Leaf Problem

    Hi all! I am hoping some one can give advice on a Rossioglossum Grande with dark brown/black spotting that is dimpling/yellowing as the infection progresses. I believe this is a fungal infection. I have fans in my greenhouse going 24/7. The leaves rarely get wet. I believe this condition was caused by high heat (90+ degrees) and high humidity). Rossioglossum grande is a intermediate grower and in it's natural environment high temperatures average in the 70's F. only, so I think it is having a hard time in this heat. I have bathed the plant, pot, and leaves in Physan 20 X2 in the last two weeks and as of yesterday I brought it in the house with bright light exposure and 24/7 air conditioning going. For a couple days after Physan treatment the infection seemed to slow or stop when the temps in the greenhouse dropped to in the eighty's F. The spotting got worse when the temps. hit 90 degrees plus again though. My questions are, should I continue with Physan 20 treatment? Should I order Physan 27 for this plant as a systemic and for future use? Any other treatments/suggestions? I knew this was a intermediate grower when I purchased it, but with those large six to eight inch, beautiful blooms I decided to make a exception and try this one. If it needs to stay inside until the heat abates so be it. ALName:  20101101_157.JPG
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  2. #2
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    I am sorry to hear you have a problem with this gorgeous orchid! I would for sure keep it in the AC. Don't know about the Physan, as I've not had to use it yet, so I will let someone else answer that. Hope it recovers soon!

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    I would keep it inside for now, where it would seem to be happier with the temperatures. Letting it go through repeated stress from excessive heat and then repeated treatments with chemicals is probably not the best option for the plant's long term health.

    I know what it's like wanting an orchid even though you know it's not ideally suited for the conditions you have to offer. I hope it works out for you.

  4. #4
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    I'm rooting for the air conditioning to do its magic. If it weren't for the AC, I wouldn't be able to have any orchids, so I really want to see it help you, Al.

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    If it is stressing like that I too would take it inside.

  6. #6
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    Hi Patty just wanted to let you know that I believe the worst is over and that all leaves will probably survive, though up close they won't be as attractive as they were. I know from prior experience with a Vanda that the scarring of the leaves is more noticeable even if the fungal infection is gone. Will leave it inside until it cools down sometime in the fall (here that could easily be November).I believe that from May to November will be in the house. The other months the greenhouse will be fine (humidity is even better in greenhouse). Connie I used your honey suggestion X 1 four days ago. How often should I dose it with honey? I used it with weak MSU Fertilizer the last time a few hours after Physan bath. Thanks you guys for your support! AL

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    Quote Originally Posted by orchidsal View Post
    Hi Patty just wanted to let you know that I believe the worst is over and that all leaves will probably survive, though up close they won't be as attractive as they were. I know from prior experience with a Vanda that the scarring of the leaves is more noticeable even if the fungal infection is gone.
    Maybe it will flower in abundance so no one will notice the leaves. That's my wish for you.

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