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  • 1 Post By raybark

Controlling black rot

This is a discussion on Controlling black rot within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hello everyone! Bad news -- quite a few of my plants got black rot and ...

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  1. #1
    cwcervantes's Avatar
    cwcervantes is offline Senior Member
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    Default Controlling black rot

    Hello everyone! Bad news -- quite a few of my plants got black rot and crown rot after moving them outdoors for the spring/summer. The new growth on almost all my Cattleya alliance orchids has rotted off and a few Vanda alliance got crown rot that killed the plant. Not sure how this happened, but I suspect the transition outside and a week's worth of nonstop rain did it.

    Does anyone have a good solution to controlling the spread of the rot? I'm now spraying 5% hydrogen peroxide solution after cutting off infected portions of plants and trying to isolate infected plants. Some are turning totally black and mushy ... Should I throw away anything showing rot in the pseudobulbs?

    Thank you for any help!

  2. #2
    jai_star's Avatar
    jai_star is offline Senior Member
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    Oh man that sounds major. I do hope your plants survive. I hate rot and have lost a few plants due to them. I usually try to do surgery and cut off the rot plant tissue. Then dust cinnamon on the new wound area. Of course using sterlised secateurs. In your case i would keep the plants undercover perhaps making something like a shade house where they stay dry but still get plenty of light. Good luck let me know how you go

  3. #3
    ksriramkumar is online now Senior Member
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    sorry to hear that, in my opinion, blackrot needs a systemic treatment with thiophanate methyl available as cleary's 3336.

  4. #4
    catasetum-ian's Avatar
    catasetum-ian is offline apprentice
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    agree with ksriramkumar, my personal preference a combo of mancozeb and benomyl

  5. #5
    raybark's Avatar
    raybark is online now Senior Member
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    Default

    FWIW, since using a regimen of roughly monthly applications of 1:100 Inocucor Garden Solution, I have seen essentially zero incidents of rot, and I have used a 1:50 solution to actually cure some that had occurred.

    The product is a crafted blend of many beneficial bacteria and fungi that wipe out pathogenic ones, stimulate the plants' own defenses, and stimulates growth.

    Holger Perner (Huengdong Mountains Biotechnology in China) has shown it to being a boon to his efforts to successfully raise difficult-to-grow paph species like tigrinum.

  6. #6
    cwcervantes's Avatar
    cwcervantes is offline Senior Member
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    Thank for the responses. I'll look into the products suggested.
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