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Jun 10, 2020 10:53 AM CST
Name: Francesco
Italy (Zone 9a)
Hello all please can you help me identify and treat this disease? Thanks a lot for any help
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Jun 10, 2020 10:54 AM CST
Name: Stefan
SE europe(balkans) (Zone 6b)
Cactus and Succulents Sempervivums Bromeliad Adeniums Bookworm Sedums
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Dont think you can "treat" a hole that size, that deep in a young plant...
I dont know what the disease is called, but it can be quite unforgiving if not handled properly.
For starters, split the plants, and check the second for any holes.
If caught early, cut with a disinfected knife(the surrounding area, and coat with cinnamon...
Last edited by skopjecollection Jun 10, 2020 10:56 AM Icon for preview
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Jun 10, 2020 11:26 AM CST
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Name: Baja
Baja California (Zone 11b)
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I don't know if there is any treatment for that problem (is the inside of the plant rotted out?) but I would recommend revising how you care for these cacti (specifically looking at light, water, soil) so that the other one remains healthy.
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Jun 10, 2020 2:05 PM CST
Name: Connor Smotzer
Boerne, TX
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There's not much you can do to really reverse that. But I have a plant that developed a big rot in its caudex, but it's still alive, but I had to take certain steps to get there. I can go into
More detail but need more info of your situation first.

Can you post pictures of the plants and entire pot? What kind of soil is it planted in? Was it repotted recently or has it ever been repotted before? How do you water and how often do you do so?
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Jun 11, 2020 1:10 PM CST
Name: Francesco
Italy (Zone 9a)
Thanks for your help, the plant is new and unfortunately the weather is Crossing Fingers! gone crazy in Italy there are 10 degrees one day and 30 the next one I fear depends on that. The marked part seems dry. I try to make a cutting and to separate the other 2 cacti. Thanks again for your help
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Jun 11, 2020 1:19 PM CST
Name: Francesco
Italy (Zone 9a)
Thanks a lot Smotzer, pot is 25 cm i ve repotted it 1 week ago from original pot. Terrain is two thirds peat and a third crumbled lapilli and perlite unfortunately I had finished them and I had no sand, maybe I was wrong and it's too rich. I watered only with a little sprayer, but the air is very humid and it often rains. Other 2 plants are ok.
Thumb of 2020-06-11/Franci/9eeca3

Thanks for help
Last edited by Franci Jun 11, 2020 1:25 PM Icon for preview
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Jun 11, 2020 1:22 PM CST
Name: Francesco
Italy (Zone 9a)
I forgot the rotten and dry part and it is as if it had a hard black crust, if the scratch and at the edges and brown like sunburn
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Jun 11, 2020 1:22 PM CST
Name: Stefan
SE europe(balkans) (Zone 6b)
Cactus and Succulents Sempervivums Bromeliad Adeniums Bookworm Sedums
Tropicals Fruit Growers Foliage Fan Orchids Bulbs Apples
Franci said:Thanks a lot Smotzer, pot is 25 cm i ve repotted it 1 week ago from original pot. Terrain is two thirds peat and a third crumbled lapilli, unfortunately I had finished them and I had no sand, maybe I was wrong and it's too rich. I watered only with a little sprayer, but the air is very humid and it often rains. Other 2 plants are ok. Than
Thumb of 2020-06-11/Franci/9eeca3

Thanks for help


Your soil should be on point,(its not a high profile species, so inorganic organic ratio is within acceptable parameters).
This may have come from humidity, physical damage, or may have been present when you bought it( it happened to me with cleistocacti and a parodia).
Last edited by skopjecollection Jun 11, 2020 1:23 PM Icon for preview
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Jun 11, 2020 1:28 PM CST
Name: Francesco
Italy (Zone 9a)
Thanks for suggestion tomorrow i ll change terrain with cacti one. Do yo think rot van propagate to the other two and is bette separate one plant? (i ll change terrain to all) Thank You!
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Jun 11, 2020 1:33 PM CST
Name: Stefan
SE europe(balkans) (Zone 6b)
Cactus and Succulents Sempervivums Bromeliad Adeniums Bookworm Sedums
Tropicals Fruit Growers Foliage Fan Orchids Bulbs Apples
Franci said:Thanks for suggestion tomorrow i ll change terrain with cacti one. Do yo think rot van propagate to the other two and is bette separate one plant? (i ll change terrain to all) Thank You!


Terrain ? You mean soil? It should be fine?
But, yes, split the plant...
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Jun 11, 2020 1:40 PM CST
Name: Francesco
Italy (Zone 9a)
Yes i mean soil sorry Rolling my eyes. thanks for suggestion
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