Fruit trees
 

I have inherited a gang of fairly old apple trees, and I have also planted some
plum, cherry, and pear trees. The meagre fruit produced over the last two
seasons have had lots of black spots on them, mainly I have to say in the old
trees. I feel I should spray them with something, or prune them or whatever.

So should I prune and if so when? Should I spray with something and if so when
and what with?

John (a total novice, who is keen to learn..!!)