Ok, I have 2 Improved Meyer Lemon trees that I got a few months ago that are showing blotchy yellow spots on the foliage. Both were potted up immediately in 5-1-1. I'm in 7a (Oklahoma City) It's hotter than blazes here and very humid so I've been watering every 2-4 days depending on how dry the soil is. None of my other citrus trees are showing these spots. I have been fertilizing with Jobes citrus spikes (3-5-5) every 4wks but will be switching to FP after reading on this forum. They both have bloomed and set fruit since I've had them, and the existing fruit has grown. Initially I thought maybe sunburn? But I hardened the new trees off and none of the other newbies are showing this.. maybe over-watering, but I'm seeing leaf curl when I've backed off the water schedule. Not sure what I'm doing wrong. Thoughts?