Leaves curling up on orange trees
I'm in Northern California, zone 9. I have a washington navel, valencia orange, and taracco blood orange tree and all three are experiencing upward curling leaves and yellowing. I also have meyer lemons, but those are fine.
These had dark green leaves about a month-two months ago. I've fed them Scotts Avocado, Citrus, Mango tree slow release fertilizer as per the label and given them FST over the months. I water once a week, and we have clay soil that I amended with compost and garden soil when I put these in the ground in April.
I also haven't noticed any new growth on any of these trees. I don't know if that is normal.
Any ideas? I've grown attached my trees :( I hope I haven't killed them.