I'm currently in Durban staying at the home of an unfortunate Avocado tree. It is a quite mature tree of 10+ years, and just this year the ripening avos on the tree have all developed a spotty white mould. Is there anything that anyone know which can treat or prevent such a disastrous thing!
Some of the leaves of the avo tree have some yellow spottage on them, almost like bleach has fallen onto them. Also, there are two large staghorn ferns growing on the tree near the base. Early in the tree's life, a few branches were pruned near the base.
There hasn't been any dramatic changes in rainfall this year and the weather is quite usual.
Let me know if you have any ideas. Sorry I can't get a picture to you!
Major diseases of avocado are anthracnose, downy mildew and powdery mildew. In some specific areas soil-born fungal diseases can be serious. The occurrence of Phytophthora cinnamomi has been recorded, but it does not appear to be a serious problem.
I like the suggestion of milk or even diluted urine as on organic control discussed in the following website.
Good luck! Avocados are my absolute favorite food.
Edit: One more possibility,