Posted: 27/07/2012 at 20:31
i had a little look online about this and this is what is suggested i hope this is of help to yourself
The best time to do major pruning on your pear trees is during the dormant season, before active growth begins in the spring. Generally, it is not recommended to heavily prune pear trees. The more you prune, the greater the chance that fire blight will develop (the leaves and branches will look as if they have been burned by fire), and it delays fruit production. It is generally best to prune pear trees late in the summer. You will stimulate the least amount of re-growth by pruning after the trees have finished growing for the year and have hardened their wood. If you live in an area where there's a chance for winter damage, wait to prune until late winter. Give your pear trees the proper growing environment. Then maintain a regular pruning schedule to enhance the best possible fruit production.
Set a three-year plan to get your pear trees into the shape and size you want. Start with a plan for your pruning project - envision how you want the trees to look. The first year remove limbs that are diseased, damaged, upright, crossing and crowded. Suckers need to be removed as soon as you notice them to avoid them turning into woody, weak wood. The next year, thin out the tree some more and bring down some of the height. The third year, thin out the trees some more and cut down to the desired height.
Always remove pruned branches from the area of your other trees. Burning the branches is a great way to prevent the spread of disease and infestation.
Pear trees bloom and bear fruit on the sharp, short spurs that grow between its branches. Thin the spurs regularly. Older spurs should be removed occasionally to be replaced by more vigorous young ones. If you end up with too many small fruits set in one year, thin them out to let the remaining fruit grow large and not have to compete for nutrients.
You can avoid ending up with too much fruit that goes to waste by thinning the fruit on the branches after it has set. Hand thin the fruits to leave at least 5 inches between the fruit. This will reduce your harvest and increase the health of the remaining fruit. It is especially a good idea to thin fruit on the high, hard-to-reach branches.