Sick Pear Trees

My in-laws have 2 pear trees in their garden.
They were ok and produced fruit every year.
Then about 3 years ago, they got some sort of rust on the leaves.
This year, they are not looking good at all. The leaves look terrible, and there was no fruit this year.

Is there anything I can treat/spray them with?

 

Theres a lot of things that affect Apples & Pears, any chance you can get a pic of the leaves or better still, scan one in so we can take a look, could be nutrient deficiency or pests as well. No good us telling you to spray with one thing if the cause is another

Lack of fruit may have just been down to the Weather, its taken loads of fruit out this year

 

Ok, I will take a photo and upload it.

 

Here is a photo of part of one of the trees, and a closeup of the leaves: