I'm Italian and I come from Puglia. It strikes me directly. It's a hard punch in the stomach, problem is that people don't want to remove this old trees, they are even centuries old and so they make the disease spread more and more as time progress and as a matter of fact the olive oil selling is their only income.
The state failed, they had no direct order to remove the trees nor economical help.
As an example in my father field where we grow olive oil trees, there are few that has this disease, but my father hasn't removed them, it's a cost we can't afford.
Now put a lot of ignorant agriculturist old men without money that have has the only source of income selling olive oil in front of this disease and you get the results.