Sunburn or Internal Pathogen

[mikethecactusguy]

Help Please. Sunburn or Internal Pathogen attack.?

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[k.maks]

I hope I'm wrong but it doesn't look as a sunburn to me.
Second picture from the top reminds me a friend's cactus. She decided to treat damaged epidermis with insecticide and fungicide and brown area stopped spreading. But neither she nor I still didn't manage to identify this thing.

[Aeonium2003]

I hope I'm wrong but it doesn't look as a sunburn to me.
Second picture from the top reminds me a friend's cactus. She decided to treat damaged epidermis with insecticide and fungicide and brown area stopped spreading. But neither she nor I still didn't manage to identify this thing.

Interesting. I thought it was only a CA thing. I got that stuff this year. It's almost like rust fungus mixed with sunburn. I haven't found a great way to treat it yet.

[k.maks]

It's almost like rust fungus mixed with sunburn.

Yes, I would describe it like this too! I saw it on a mature Astrophytum nudum.

[Aeonium2003]

It's almost like rust fungus mixed with sunburn.

Yes, I would describe it like this too! I saw it on a mature Astrophytum nudum.

Maybe a mediterranean thing. It only happens in out wet winters.

[k.maks]

Maybe a mediterranean thing. It only happens in out wet winters.

Could be a high temperature and high humidity area thing

[keith]

Maybe sunburn because of where you live now ? Sunburn will turn the skin white like it burns all the chlorophyll away. Pathogen I think would have sap leaking and be soft. The black stem almost looks like frost damage ? probably have to cut off the affected parts .

[Aeonium2003]

I have no idea how it works. Even cut wounds seem to get this disease/infection.

[Download]

It's possible sunburn let a pathogen in.

I'd treat with fungicide (I personally use mancozeb).