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Cattleya problem plant..

This is a discussion on Cattleya problem plant.. within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Originally Posted by Kauaiguy Copper Fungicides may slow down the spread of Black Rot but ...

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  1. #11
    Chris in Hamilton's Avatar
    Chris in Hamilton is online now Senior Member
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    Quote Originally Posted by Kauaiguy View Post
    Copper Fungicides may slow down the spread of Black Rot but I don't think it's the answer to eradicating the problem.

    I think that you'll have to go with something containing the chemical I mentioned above (etridiazole) or as mention in one of the St Augustine articles, the author uses something called: Subdue. Both are very expensive, so you'll have to weigh the cost of the chemicals vs the cost of the orchid.

    I guess it will have to come down to: 1) How much you like this orchid? 2) Is it spreading to the others? 3) Is it replaceable?

    The unknown answer of course is: Will it work? Hard to justify the cost if the results is minimal. At that point I would stay with the copper fungicide since it seems to slow it down some. I've also read somewhere that cinamon is being used to control the fungus. JMO
    I guess if there were a lot of plants or something very expensive I would try an expensive treatment.This one cost me $20 so financially no sweat. I'll probably just keep it but not in the living room. Sort of like the vase your mother gave you that you're a bit too embarrassed to display. What I don't like is the effort put forth with no floral reward Thank you and everyone else for your comments. I'll probably kill a few more in short order.

  2. #12
    Dorsetman's Avatar
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    Basically it is heat damage, leading to dead cells. , in my opinion. When dead, sure they rot, or whatever.
    The fact that the plant gets the same treatment as others which are OK, is irrelevant , as different plants have. Different tolerance.

  3. #13
    Chris in Hamilton's Avatar
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    Quote Originally Posted by Dorsetman View Post
    Basically it is heat damage, leading to dead cells. , in my opinion. When dead, sure they rot, or whatever.
    The fact that the plant gets the same treatment as others which are OK, is irrelevant , as different plants have. Different tolerance.
    So, the fact that it happens at pretty much the same stage of growth which would be about the same time of year? May be, last weekend the temps got into the 90F range and with the humidity factored in felt like 104F. This weekend it will be the same. I turn a fan on at that window as the sun starts to hit it this time of year, may be I was too late. Thanks Geoff!

  4. #14
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    If it isn't a virus and the fungicides are not working, it might be a mineral deficiency. Adding extra Calcium, Magnesium and a little Iron might be helpful. Your old growths won't be helped by remedying this but the new growths would grow clean. It is worth a try.

  5. #15
    Chris in Hamilton's Avatar
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    Adding a bit of calcium today. Thanks Leaf!

  6. #16
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    I'm interested in the answer regarding heat.... My few Catts are in a Southern window and do have some heat spotting, but it doesn't go sunken in like that. I'm going to either have to move them now as summer is starting and we have very hot summers, even the AC won't keep that window cool, or I will have to put some shade cloth on the outside of the house. Some of them do spot more than others, I hope they'll get enough light under lights this summer or in the Eastern window. I've got to post pictures, have two Catts blooming now....

  7. #17
    Chris in Hamilton's Avatar
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    Quote Originally Posted by Carolla View Post
    I'm interested in the answer regarding heat.... My few Catts are in a Southern window and do have some heat spotting, but it doesn't go sunken in like that. I'm going to either have to move them now as summer is starting and we have very hot summers, even the AC won't keep that window cool, or I will have to put some shade cloth on the outside of the house. Some of them do spot more than others, I hope they'll get enough light under lights this summer or in the Eastern window. I've got to post pictures, have two Catts blooming now....
    I'm quite sure Geoff nailed it Carol. I've moved itin from the window a bit more and placed it above the air duct. 90F here today. I'll update in a few weeks. Hopefully the leaves will still look good (except fro the one pictured of course) Really don't like ugly plants!

  8. #18
    Carolla's Avatar
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    Ugly plants like that one scare me, with the depressed areas I start to worry if the plant will make it. I think that you are right, Geoff nailed it, and that will help me to work with my own Catts to avoid similar issues.

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