Hello
I am an backyard apple tree grower. Most of my knowledge comes from
reading and trail and error , a fair amount of error . The majority of my trees
are on dwarf M9 root stock. I do have aGrimes Golden on M7.
Here are a few things to check.
#Most apple trees need to be cross pollinated with a another apple with viable
pollen. Do you another apple tree close by?
# It is good to do a lot of the prunning on dwarf and semi dwarf apple trees
in the late spring and summer.
Fertilizers with high nitrogen content will promote vegitive growth at
the expense of fruit set.
Bill