Citrus fruit are native to Southern China, it's fair to assume they are adopted to the climate here. "Summers" are almost the entire year with the exception of

Citrus fruit are native to Southern China, it's fair to assume they are adopted to the climate here. "Summers" are almost the entire year with the exception of maybe three months when it gets cooler. It's subtropical climate. I have not been to Florida but Wikipedia describes it as "humid subtropical", which would be exactly identical to places like Guangdong. >Climate change is not homogeneous, and affects different regions differently. That's true. So has it gotten cooler or hotter in Southern China over recent decades? We should look at that: Temperatures have increased here also. So what leads to an increase in production in one place leads to a collapse in the other? All I'm asking is have you considered the possibility that it may not be related to climate at all, not even indirectly? Because disease can be caused by other factors, if that's the actual culprit. Another user has suggested simple economics, which is more often the real cause for abandoned farms.