Hi all.
My infected lophs have been without water and spraying now long time.
It seems rust is spreading but the speed of it has reduced. I take picture to you from my lophs what have sum damage. There are 3 willy texensis and 2 willy el nunez. Worst damage is in el nunez peyotes.

What do you think? Should I keep one or two weeks more then without water and let them dehydrate.
Now their skin doesn't crack when I gently put pressure to them but the damage is very visible cause of they have indeed been full of water and that's why damaged skin has cracked so damage is there.
I wait some time more and hold with watering to let 'em dehydrate for good. I do this for every loph I have.
When I water them I water them with neem oil water. I dip the pots in the pool of water. get real water, not use tap water anymore. I go out, get big bucket and fill it with snow. Then I let snow smelt and make water from it. pH of tap water is too much.
I don't know for sure, every time I have used tap water, I have encountered some problems what doesn't seem like pests. Ofc this is obviously spider mites but I mean I have got problems before and only connection to another similar problems but without mites has occur when I have used tap water.. With tap water lophophora will not even flower so often.
So now! I got 10Liter bucket! Fill it with snow! Let it smelt and TA-DA I have best water cactus can have.
I think I water lophs after week. Then they have been 2 weeks without any water.
But someone was right. I should stop watering during these problems. Watering has make lophs swollen with water, skin damage has prevent skin to be elastic so it has simply cracked.
I'm not sure are there spider mites, I think there are some population still. BUT I reduce watering periods. I give water every two weeks. When I give they got neem by systemic way and when summer comes, neem should have done it's job.
I can't use my sprayer to spray pure water on top of lophophora cause when I use it and spray, even I don't have add neem to it, it smells to neem and I think in my spray bottle, there are small amounts of neem what comes every time.
Now I don't have use any spraying with neem or even give them water cause it cracks skin. I wait them to "rest" and recover for a while, then water and look does there come new good growth from ribs of badly injured peyotes.
One indicator to that neem has make damage seems from the picture. Side what has been got light(they are at windowsill) has more damage to goes up of the peyote crown that damage what has been at shady place.
But now I have the knowledge that peyote skin takes very easily damage via oil based insecticides. Good thing i have heard from neem that is works as fungicide as well and I will do like Mostly_Harmless has said that give neem by systemic and wait long time, spider mites will disappear. I just wait summer.... Then humidity goes up and spider mites will go away when humidity are >50%
We will see how these going. They may show more damage later cause I have notice that neem oil damage comes but there is delay like 1-2weeks.
But good new is that skin doesn't crack any more!! 
Hope I got after summer they look like there are no new spider mite damage.. Then I would be happy.. And after few seasons, damage is hard to see and they are beatiful again
Edited by intelligentlife (03/21/13 09:39 AM)
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