We have many other types of trees that don’t seem to get impacted.
Apparently most trees produce one or more resisting substances that citrus trees don’t.
Genetically modified trees should be developed and marketed.
The European nutcases may not like that, but I like orange juice.
I live next to a swamp. The greening and black mold are horrible to my orange tree. The only thing I’ve found to work is nano silver water with some dishwashing liquid mixed in then sprayed on the tree every few weeks.