I have a 3 year old Braeburn Apple tree that produced well the first year but since has not. I understand that it is self pollinating so pollination should not be an issue. I also have a Summerville and my neighbour has a tree of unknown variety. Why do you think most blossoms are dropping?

i just copper sprayed for a blight and will so again after harvest. We live in Vancouver Isalnd, zone 7. The garden shop told me the blight shouldn't have effected the fruiting.