There is a citrus Armageddon down here. Not the freeze, however. It’s called “greening”. In 20 years there won’t be much citrus left if it’s not fixed.
https://agrilifetoday.tamu.edu/2021/11/30/new-research-takes-aim-at-devastating-citrus-greening/
I suspect like many diseases we humans have, somebody knows the cure but… man, the funding they get to research it….
Israel citrus seems to have the same problem. It’s spread by a small insect.