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  #1  
Old 04-15-2021, 02:43 PM
Maru777 Maru777 is offline
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I hate collar rot! Help! How do you prevent it? Female
Default I hate collar rot! Help! How do you prevent it?

Hello everyone! I need a bit of advice because I am currently having a meltdown because of this blasted collar rot. 6th time it happens to me (over 4 years, bit still). There must be something that I am messing up here because there is a pattern. Every time a plant got this is was a new plant that I repotted after purchasing. Various media - bark for some, lecca and SH for some others. I never got this on a plant that I had for a while and also it only seems to happen after I repot them because for ex 2 of the 6 I repotted about 2-3 weeks after buying and that was when they got hit. It’s so weird. Out of the 6, 3 I saved (though set back significantly because I had to cut pseudobulbs out before the thing spread), 2 I lost and one I am currently struggling with. It’s always the sympodials - though blessedly not all of them that I bought and repotted that had issues. I do live in a highly humid and very warm place but that seems fine for the ones that make it past the first repot. I’ve repotted the others dozens of times and they are fine and so are the new ones that do not get it on that first repot. Sigh! What do more experienced growers do? Anything that does not involve very heavy chemical use I would be wiling to do - I have a couple of tiny frogs that came from God knows where and live in some of my pots so I am careful with the chemicals I use to not kill them. They are cute Is there any hope that I can avoid this happening again? When I see that unholy buttery color I want to cry
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  #2  
Old 04-15-2021, 03:04 PM
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I'm not clear on what you mean by collar rot. Usually I've seen this term used for rot around the base of monopodial orchids like Phals. Could you explain more, and perhaps show photos?
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  #3  
Old 04-15-2021, 04:22 PM
Maru777 Maru777 is offline
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Quote:
Originally Posted by estación seca View Post
I'm not clear on what you mean by collar rot. Usually I've seen this term used for rot around the base of monopodial orchids like Phals. Could you explain more, and perhaps show photos?
This is the best description I found Orchid Diseases and they called it collar rot or southern blight. I just call it the bane of my existence they only show pictures of phals but the description they have is spot on “ The main symptom of Southern blight or Collar Rot is a rapid collapse and rotting of the roots, pseudobulbs and lower parts of the leaves. Roots, pseudobulbs, leaf bases and the lower part of stems turn creamy yellow. The affected tissue becomes brown (resulting from invasion by secondary pathogens), collapses and rots very rapidly. The disease eventually girdles and destroys the entire basal portion of the plant. Affected leaves yellow, wilt and die.
Small yellow or tan sclerotia resembling mustard seeds form on the affected tissue”. Looking for some pictures that I took of them and will post in a bit. I hate this thing sooo much
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Old 04-15-2021, 05:19 PM
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You may have it in your environment. There are several hundred host plants that can “seed” your local growing area.

Heat and humidity favor the stuff, so you might want to spray the entire area with a disinfectant. Even a 1% bleach solution will help.
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Old 04-15-2021, 10:36 PM
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If that's what you have and it's only happening after repotting, my guess is that organisms are entering small wounds occurring during repotting. This situation is common among cactus and succulent growers living in much more humid climates than the plants have in habitat.

I would suggest rethinking your repotting practices to minimize the risk of pathogens attacking your plants.

Wait for a day with lower humidity. This might mean not repotting plants during entire wet seasons, but waiting for dry seasons.

Make sure the plant is in completely dry medium before proceeding.

Then repot the plant into completely dry new medium, but do not water. Wait to water for a few days, so scratches may heal and not provide a means for organisms entering.

If available to you, at the first watering after repotting, use a mycorrhizal preparation at the dilution recommended on the label. Spray the entire plant as well, so it is covered with the solution. These contain beneficial soil organisms that can inhibit pathogens. I started using these when repotting all plants, and when removing orchid seedlings from flasks. I have had excellent results in preventing various rots.

It is always important to have a clean repotting bench. However, organisms causing various rots are common in the humid tropics. Spores are wafting around in the air. Try the suggestions I've given and see what happens, especially if you can get a mycorrhizal supplement. Ray sells one on his Web site.
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Old 04-17-2021, 07:24 PM
Maru777 Maru777 is offline
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Thank you both for the advice! I disinfected everything again, but I think you’re right that it’s just in the environment, just so weird how it only affects them on the first repot. I do my best but absolutely sure I damage some roots in subsequent repots too. Maybe they build immunity after a while or maybe they are less stressed since the ones I buy are usually pretty traumatized by the import to the island. I will give the dry repot a shot too. I had never considered it but it does make sense. Might also keep them in the house where temps are a little cooler and humidity is much lower for a few days after repot. I have 2 new ones I’ve been afraid to repot but will try with these suggestions. Thank you very much!
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Old 04-17-2021, 09:30 PM
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Maru ----- you could maybe even try once - when you see signs of it occurring ----- a copper spray for plants/orchids ..... or even (if you have it) monterey garden-phos spray.
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Old 04-18-2021, 06:32 AM
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You might a plant probiotic, as they are known to kill and protect against several pathogens.

On the assumption they might be hard to find locally, try brewing up a little colony of Brewer's Yeast (Saccharomyces cerevisiae), and apply the solution monthly.

I'm not sure of the mixing ratio, but some instructions I have read suggest 5 ml yeast + 10 ml sugar or molasses in 1 liter of non-chlorinated, acidic (pH ~ 4.5 using vinegar) water, can provide the decent dose in 24 hours.
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