Only one other neighbor grows Delosperma. She only has a little bit. She does not have a problem.
So far there has been no more die off. BUT it has been dry. We have a chance of rain every day this week. So we'll see what happens. I took pictures of every Delosperma that I have so I have a record to compare future growth to.
I debated digging up the problematic plants and replacing the soil around them. So far I have decided against this. I figured it will only stir up the fungus in the soil.
My sections that I removed and potted up do not look very good. But hopefully they are just pouting and will perk up soon. And hopefully I will not even lose the original plants.