Asian pear trees benefit from annual pruning to keep the fruit and tree free of diseases. A good annual trim opens up regions of the tree to light and air, which promotes fruit ripening and wards off disease. While the first three years of a new Asian pear tree's life are spent on shaping and training the tree, trimming of mature trees focuses only on removing undesirable growth. Prune your Asian pear tree annually in late winter or early spring while the tree is dormant and has no foliage. Wait until frost danger has passed to prune.
Check over the branches of your Asian pear tree looking for dead, diseased or damaged growth. Diseased or damaged growth will bear physical blemishes, discoloration or scarring. Dead wood will be brittle.
Prepare a 1:10 solution of bleach to water in a bucket and place your pruning tools in this solution. Cut away any undesirable wood with pruning shears, snipping it off at the base or trimming back to a Y-intersection. In between each cut, rewet the pruning tools in the bleach solution to cleanse them.
Remove any suckers that grow from the base of the Asian pear tree or from the graft site, identifiable as a horizontal scar near the base of the tree. Suckers are vegetative shoots and will never bear fruit; they sap energy from the tree. Clip them off at the base.
Cut away any wood that crosses over other branches. Also remove any branches that grow vertically up from other limbs or those that grow downward rather than out or upward. This opens up the canopy and allows light and air circulation, which ripens the fruit and keeps the tree healthy.
Remove limbs that grow too close to vertical, such as those that make a tighter than 30 degree angle with the tree trunk. These branches will continue to develop poorly, will cast shade on the branches below them and eventually hit other fruiting wood.