Thing on a Cactus

My mate John just sent me this Should he visit the clinic??

 

http://www.thecactusdoctor.com/? Or maybe that's more suitable for people with a droopy Saguaro.

 

Blimey, there's some huge ones on that site

 

...i'm not clicking on it.

 

@Zigs, I think your mate is too late for the clinic. He should get straight down to A&E.

 

Looks a bit like insect damage, or possibly keeping in a damp cold atmosphere.
I've seem it before, once its marked like that there is not much you can do other than improve the growing conditions, to stop the same thing happening on the next bit of new growth.

The plant also seems to have a slightly marbled effect, is it a variegated one?

 

Ta Pete, i'll ask him

 

Ee says its not meant to be variegated.

 

Oh, it might besuffering a bit then, but I wouldn't like to say from what.

The only definite thing I can say is, its not very well.

 

The first look at it makes me think it is lacking light.
Has he watered it and left it wet? Those black bits look a bit like the markings you get from over watering. It should be kept dry in the winter unless it starts to look very thirsty.

 

Only just seen your reply Lea, i'll ask him

Apparently it's a huge one and he doesn't want to loose it.

 

Just seen your reply Marley

@John41

 

Im sure i found something similar on one off ours,i think i just sliced it out delicately at dusted with yellow sulpher powder but i dont remember any mottled effect
Im no help...i know

 

Sulphur sounds good Joolz