How to treat this disease

As you will see from the pics the fruit is going black on the end. This is the second year this has happened, last year we just put it down to the weather being so wet, but cant blame that this year. Any idea what is causing this and how totreat it?
Thanks

 

Hi Nigel

it looks like a Medlar ? tree

I think it may be (black rot caused by a fungus called Botryosphaeria obtusa ) do you have "canker" on the tree as well ie on the branches , looks like a dark stain on the wood and may be dead small branches ? dotted all over the tree

It would need treating with a garden fungicide for the apple problem.

Spruce