My main concern is that if you start cutting off branches or twigs of any size, at any other time than July, your tree will develop silverleaf infection and within a few years your tree will die.
It sounds as if your tree was trained to grow flat against the fence, called fan training. Go to some garden centres and look for books on training fruii trees where you will find diagrams and pictures of what to do. Some books make it complicated but there are some very good ones which are easy to follow, the thing about having a book is you can take it out in the garden and have it next to your tree as you shape it and prune it.
All you need to know is on that link, there's also a link at bottom for pruning mature fans. Doesn't cost a penny, and if you need it in the garden just print it off.
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My main concern is that if you start cutting off branches or twigs of any size, at any other time than July, your tree will develop silverleaf infection and within a few years your tree will die.
It sounds as if your tree was trained to grow flat against the fence, called fan training. Go to some garden centres and look for books on training fruii trees where you will find diagrams and pictures of what to do. Some books make it complicated but there are some very good ones which are easy to follow, the thing about having a book is you can take it out in the garden and have it next to your tree as you shape it and prune it.
http://apps.rhs.org.uk/advicesearch/profile.aspx?PID=626
All you need to know is on that link, there's also a link at bottom for pruning mature fans. Doesn't cost a penny, and if you need it in the garden just print it off.
A picture would clarify a lot.