[dice]

I do not know if Curly Top is common here. The plants simply
behaved like the descriptions and pictures of it. I suspected that
it might be something in the same family of plant virii as Curly
Top, a variant maybe, or a viroid (like the Potato Spindle Tuber
viroid that you mentioned).

The "stopped growing" part of the symptoms is always
suspicious, although that can be a phosphate deficiency
symptom, too, hence the foliar feed with a high phosphate
fertilizer. When I have let plants that looked like the ones that
I pulled go for the entire season, they rarely put on more than
a few inches of additional height once the symptoms appeared,
and the fruit that ripened were not up to their usual taste
standards for that cultivar.

I do know about physiological leaf roll, and that is something
that I usually ignore. When I saw that on Black Krim, for
example, it always started with the lower leaves and worked
its way part way up the plant. The disease that I described
in posts above starts on the top, on the newest leaves.
The plant will produce a couple of more sets of leaves before
it stops growing completely, and those all end up with the
leaf roll and purple veins symptoms.