beech trees black spots

[green thing]

Hi anyone know anything about tree fungi
We had several the largest beech trees in the area
the problems . It seem to start with black spots then sap
Oozing from them then shortly after they start to
Fungus growing on them.
The next year they are dead.

can anything be done to stop it or prevent it.
Once the fungus starts growing is the tree already
Dead.
Is it best to remove the trees or just let nature take its
Course