Try to buy fruit trees grown on EMLA or virus free rootstocks, and froma nursery specialising in fruit that achieves good standards of husbandry. It's far easier keeping an already-healthy tree in good health, than it is trying to get clean a tree that had bugs or diseases to srart with.
2] Grow newer disease-resistant varieties
Choose varieties that are described as having good disease resistance. These tend to be much easier to grow well and more forgiving if you are a first-time fruit grower. A lot of the older varieties have some wonderful qualities but they can also be more prone disease[there are exceptions] Wait until you have a little more experience before trying these.
3] Avoid high nitrogen fertilizers
Fertilizers rich in nitrogen encourage a lot of lush new growth. This is a good thing, yes? NO! This is just the type of growth diseases and creepy crawlies love. Aim for a sustained and moderate rate of growth. Use balanced feeds like bonemeal, growmore or seaweed maxicrop.
4] Don't be afraid to prune.
Especially with the aim of keeping a fairly open crown. You don't want a congested leafy centre to the tree; this cuts out air corculation and light and encourages sooty moulds and mildew.
5]Feed the birds!
Encouraging a good population of bird-life to stay in your garden pays rich dividends because they will in turn rid your trees of caterpillars and aphids. It's true and it works - I speak from experience!

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