This year the local olives, including ours, are infested with olive fruit fly larvae.
There are little holes and pits on the outside of each fruit, and inside a yellow maggot the size of a grain of rice
The maggot leaves brown tracks and tunnels and makes the inside of the olive gooey.
The local remedy is to hang a bottle trap in each tree with an anchovy as bait for the flies, and to spray the trees.
Apparently it’s easy to control, but it depends on everyone doing it.