Fero - Sunburn or malnourished???

[cyansky]

Good day all:

I am trying to determine the cause of the bleached base of my two young Fero Wislizeni.
They have been this way for some time, and I believe it started last summer while in the hot direct sun for extended periods.
I have since kept then off the front line, and away from the direct sun. I think they may have improved some but they still have the "tan" colour at the base. I fertilize often, and they are in a good mineral mix so the only thing I can think of is that they were/are getting too much light.

Can anyone diagnose another cause? What can I do to get them back to their proper state?

Thank you.
Andrew

[peterb]

To me, the plant doesn't look like wislizeni. Anyway, the tan base can signal orange rot, root mealybugs, etc. It can also not indicate a problem. I don't think it's due to heat or sun. Feros are pretty tough.

Peterb

[Peterthecactusguy]

I doubt it's from over watering either, but might be from bad soil, root rot, or orange rot, slime mold or something lik ethat. I dont know about cold either
BTW not sure which Fero it is..