Hi,

at the beginning of this year, I noticed my cacti getting browner and/or having this strange orangey white coating on them. We lived in a very damp flat so wondered if that was something to do with it so moved them a couple months ago to my dad's place on a window sill (also likely better direct sun in mornings at least) but are still getting worse each week. Peyote are looking bad around base of cactus, much more shrivelled and less firm than they used to be.

Any ideas?

Many thanks

Please, any advice would be massively appreciated. I'm very worried about them!

Well, this thread has seen almost 50 views and nobody has replied, so I guess we are mostly drawing a blank. Maybe someone will be able to offer some insight.

Thanks Baja_Costero.

Open to suggestions of what it may be from anyone. Thanks all!

Your Lophopora williamsii looks like it is growing out of the problem. The thin white coating looks kind of like spider mite damage.
DId you treat them with something?
The other cactus look like it is a different problem. More of a fuzzy or maybe hard crusty brown growth. Maybe it is a fungus. But very hard to tell. Try to get a close up photo of the brown spotting.

The best tool for identifying problems is a powerful magnifying glass.
I use a jewelers loop to examine my wounded plants.
Once you can see the "bugs" and can determine what kind they are by using the internet then you can come up with the appropriate treatment.
Even fungus is possible to see with a strong magnifier.
A typical magnifier is 2-4 power and the loop I use is 10 power.
You can find inexpensive plastic ones on Amazon.