I planted about a dozen fruit trees in my walled garden 3 years ago. Last year one of the apple trees, Falstaff, had a lot of redish/brown blotches on nearly all the fruit.
This year it had spread to the next tree, Jongola, and there are also holes in some of the apples. I thought perhaps the blotches are weaken the skin and some bug gettin in to eat them. Now the next tree, Fiesta, has the holes but hardly a blotch. All the trees are against an old lime plaster wall and I know the soil and water retention are not good.