Our Honeycrisp Apple tree is about 6 years old and we have kept a tall fence...
Our Honeycrisp Apple tree is about 6 years old and we have kept a tall fence around it because we have hungry deer. This year it produced 30+ apples, however they are really deformed. What should we do? I have a second question, because our tree is surrounded by a fence we only trim the grass around it twice a year and last fall we noticed it had all these tall runners, should we just cut them?
I suspect apple maggot based on the photo you sent but if you look at this link you may be able to answer questions about the interior of the apple and pin point an exact diagnosis and treatment program.
To answer your pruning question it is helpful to keep this area clean for health/sanitary reasons. And correct pruning is also critical in maximizing apple production. See the link for more information. "Remove suckers (vertical shoots growing around the base of the tree). These can be removed throughout the growing season as they appear."