In my studies I have to submit plant sheets with each assignment. If anyone would like to see any please ask.
One of my plant sheets is on the Olive tree. I recently came across Olive trees in someone's garden where all of the leaves had dropped and others where they were turning brown with round patches. The branches were brittle and covered in a 'sooty' fur.
This is a fungus called 'Spilocaea oleaginea' and is common in this region. Infact the more Olives I look at the more I see it.
Treatment is a copper fungicide, good drainage, opening up the canopy of the tree and a good feed of manure and engrais.
If you talk nicely to them this can also have a positive effect !