Black fungus around apple trees

I know that this is a desease and that I much cut and burn those trees, but is there something I can do to prevent this? A companion planting? A natural treatment?

Thank you

isabelle

Is this black fungus on the tree itself ? On the bark or leaves ?

As far as I'm aware, there's very few diseases, and even fewer fungal issues where there's no option but to kill the tree.
As Wayne asks; what else can you tell us about the situation?
A photo would be best of all!

No not to tha leaves, on the trunck and branches...

I found this on the net.

webpage

Isa