Posted: 01/04/2013 at 17:55
Hi preksha, that is Pear Rust and all you can do is inspect the tree regularly and remove any leaves which have the orange spots. According to the RHS there is no chemical control, unfortunately.
Lots of us had no apples last year. It was due to lack of bees to pollinate them. The early heatwave we had encouraged the trees to flower, but then it went cold and the bees stayed at home. You can try hand-pollinating them using a small, soft paintbrush etc (a makeup brush works well.) This will only work if you have self-pollinating apples, or if you have more than one tree in blossom, in which case keep going from tree to tree to try and get a mix of pollen on the brush.