Usually my citrus trees yellow and drop from too much water. But if you let them dry out, they come back. With all the rain we've been getting recently, I had to actually move my trees to a drier location. Less sun for now, but they're too drenched. I have a nice crop of limes on one tree and a whole bunch of calamondins on another. My ponderosa lemon dropped its fruit earlier in the year......from getting too much water.