We have two apple trees in the back yard which have been totally neglected for years and have become very overgrown. I would like to try to reclaim the trees for harvesting good, healthy fruit. I think it's going to take some work though, and I don't know where to begin.
My main questions are:
1) the fruit gets grey spots all over the skin, what are they and how can they be treated?
2) how to deal with insects?
3) how best to fertilize and care for?
4) how best to prune a tree that has not been pruned in the past and is way overgrown?
Can anyone give me some advice or suggestions for where to look for information?