I planted a John Downie 3 yrs ago and the first year it was great and we had lots of fruit. the second year OK but this year the leaves came out well but got covered in a black dusty mould kind of substance and subsequently fell off or failed in some other way. We had flowers but little or no fruit. this could have been because of a very late frost up here in the north west as some of my other apple trees had poor fruit but non had this problem with the leaves. The tree is now loosing most if not all of its leaves. Any advice would be great.
We did plant another of the same variety last year because of the above and although it is not more than 15' away has fruited well and has non of the leaf trouble.