So I live in South Miami Florida, and between the county cutting down all of our citrus a decade ago due to canker and the newer threat of Citrus Greening, its hard to find healthy citrus trees down here. But from what I've learned from some friends that still have trees, as well as nurseries in my area that have pretty large, mature, and healthy looking citrus is that if you keep a tree on a CONSISTENT fertilization schedule and spray schedule. The healthier the tree, the more resistant it is to greening. But if it does contract the disease, I found this video online regarding heating the tree to kill the bacteria....has anyone seen this or have experience with this or any additional information? Yes, I know it seems like a giant task to save a few backyard trees, but its doable, especially with a large accordion style system, almost like a slinky that can be easily erected around a tree.
https://youtu.be/zKkyHIyP8e4-Jon