Thank you again for the response. In reading this forum, you are a very patient person, responding to similar questions over and over.
I think I found the problem. I took a dozen soil samples from my yard, including bare areas and just adjacent to a few plants, mixed each with equal parts distilled water, let sit for 30 minutes. Digital pH meter, calibrated with buffer solutions, showed pH range 7.7 to 8.9, with almost all samples over 8
Only two were below (one at a hydrangea and one at a camelia).
Well, it's probably official, my soil sucks. That explains many things about this garden. Back in February, I applied sulfur per package directions to most of the trees, including the citrus, but from what I'm reading, reducing pH for soil is only temporary. Ugghhh.. I'm wondering if I should dig the two citrus out and put them into pots now, or just keep fortifying and watching the pH?