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  #1  
Old 06-10-2019, 04:20 PM
meridiannight's Avatar
meridiannight meridiannight is offline
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Paphiopedilum rot Male
Default Paphiopedilum rot

Today I discovered a rot on my only Paphiopedilum.

It had been very slowly developing, with next to no outward signs of trouble. There was one brown spot on a leaf, but it had been small until now, and didn't look problematic (came like that from the nursery). Only in retrospect do I see its significance. (The spot looked like Erwinia).

Anyway, the leaves all look completely healthy except for that single one with a spot that I removed. It was crown rot at the base, deep down in the potting media. Rotting media was surrounding the base of the plant and the roots down there. It didn't become visible until I took the plant out of the pot. I removed most of the roots, saved a few. Sprayed it with hydrogen peroxide. Cut the flower spike and potted it into a new pot. No idea if it's going to survive...

Oh, and some little black bugs (winged) had been living in the potting media as well.

This Paph has been with me for a month, and I really like it. Any suggestions on how to treat it now, to increase its chances of survival?

Last edited by meridiannight; 06-10-2019 at 04:25 PM..
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  #2  
Old 06-11-2019, 02:38 AM
aliceinwl aliceinwl is offline
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Hydrogen peroxide sprayed on roots can be lethal because it damages the tissue. Donít apply any more to the roots.

Are the roots still alive? Are there any unaffected fans? I ended up having something similar happen to a Paph I waited too long to repot. In my case the roots looked okay as well as one established fan and one new fan. I divided mine and was able to keep the bulk of the root mass with the one established healthy fan. The one healthy new fan, however, separated without any roots.

I decided the systemic fungicides were more toxic than I wanted to deal with. I potted up the healthy and diseased fans separately and put the healthy rootless fan in an ICU set-up (overnight soak in Kelpmax, then potted into moist spagnum, with the pot placed in a clear container with a ventilated bag over the top to reduce water loss).

Over the next month all of the fans that showed any signs of rot succumbed: rotted out at the base. The one healthy fan appears to be okay and the rootless healthy fan is also growing. Iím definitely going to be more proactive about repotting my Paphs.
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  #3  
Old 06-11-2019, 07:26 AM
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meridiannight meridiannight is offline
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The roots are still alive. I looked up how to deal with this thing, and it was recommended to use hydrogen peroxide in cases of rot, if one didn't have or didn't want to use a fungicide. I have no fungicides.

I have only 2 fans, and I think both were affected. I didn't separate them. I potted them both up in the new pot. Crossing my fingers they survive.
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  #4  
Old 06-12-2019, 01:13 AM
aliceinwl aliceinwl is offline
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Hydrogen peroxide is just going to kill vulnerable surface tissues: your plants roots and any exposed fungal tissues. Fungi growing within the roots will be fine and root function can be severely damaged due to injury of surface tissues. You might be okay with a surgical application to a mushy spot, but roots shouldnít be sprayed prophylactically. This seems to be a very popular treatment on the internet :-(

If you have access to a kelp based rooting stimulant that may be worth a try to boost health and promote new root growth. A picture would help. Cutting leaves is risky but is sometimes an option if the rot can be removed safely that way.
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