A 50cm T. pachanoi was watered daily for more than 3 weeks, during which time it developed several black holes (biggest was thumb-size) not more than 5cm above the soil. The flesh was soft to the touch and appeared to be clearly rotten.

Powdered cinnamon was applied on the holes, together with 2 doses of carbendazim emulsion in water.
Almost a week later, the holes are healing and they are hard when pressed. They have clearly not grown further.

This is just an example, but I want to show that the common recommendation of cutting the cactus whenever there's rot is not necessarily reasonable. Treatment is very possible and should be contemplated.

Cool to know!

I've seen some cases resolve themselves and others totally destroy large plants quickly, I hated waiting and watching and performing surgery on large spine laden columns.

I will be trying out the cinnamon for sure!
Thanks!

Wow! thanks man.
I have lost a few cacti to rot over the years, will definitely try this.
Where did you get the carbendazim - as far as I know it's a tad controversial and has been linked to infertility in lab rats - Just worried about my "crown jewels" and wondering if any of it gets into the cactus?
Could you detail how you applied the "cactus medicine"? and what measurements of each was used.

Thanks again for the info!

Peace
PW

It does enter into the cactus, since it's a systemic treatment. However, it is degraded and should be safe to eat after some time. According to the instructions, it persists in fruit trees for 2-3wk, after which they can be (safely) harvested.

If you are worried, you could allow the plant to live, say, 6 months before cutting, and I'm sure that no carbendazim will persist.

Regarding the application, I used the recommended dosage (one spoon in my presentation) in 1l of water, shaken to form an emulsion. Then I simply watered. It is readily absorbed through the roots.

Thanks a lot Adivino
yeah I'll let them grow out for a few months, any talk of infertility makes me nervous.

Gonna try this on one of mine that has a few spots of rot. I was planning on operating on it this weekend.

Peace
PW

Highly appreciated.

anyone use sulphur powder ?

Thanks Adivino, that information is most valuable.

I have a San Pedro growing and plan on buying more cacti so
this comes in really handy. I never knew Cinnamon was a
fungicide. Garlic appearantly is one too.

So adding garlic powder to rot-wounds could have the same effect.
According to Wikipedia Cinnamon Oil is easy to extract:
Grind Cinnamon to powder, Macerate this in Seawater, Destill the whole.
This could be a super potent fungicide that is easy to apply to rot-wounds.

Perhaps you could strain strong Teas from both Cinnamon powder & garlic powder.
If the fungicidal compounds are watersoluble they might just be absorbed by
the plant's roots if such garlic-cinnamon teas are added to the water given
to to-be-treated plants.(Might be nececairy if fungi persists deep within a plant)

I was just reading an article on Thymol, a mayor constituent of the essential
oils of Thyme, Oregano and other herbs. Appearantly Thymol also has strong
Fungicicdal effects, making Oregano and Thyme oil good candidates for
medicines to cure plantrot and fungal infections of the human/mamalian body.

SKA, bear in mind that while some compounds could present antifungal properties in vitro, they are probably not taken by the roots. You could use them for wound healing, but not necessarily dissolved in the water for irrigation. Just saying.