I have six paw paw trees, all of which were going fine, then almost all together started to develop these black spots on the leaves and fruit.
It has progressively gotten worse, and caused most of the leaves to fall off, the fruit seems to suffers severely from it, and either falls of or rots on the tree.
Is this common, what can I do to remedy the situation?
I've tried a copper based anti fungus spray, as well as white oil, and also just generally improving the soil with fertiliser, and manure.
The affected leaves fall off, new leaves shoot, and soon they suffer the same fate.