The fruit may be dimpled and pitted, with brown trails winding through the flesh. White, tapered, legless maggots about 3/8 inch long may be present in the fruit. Severely infested apples are brown and pulpy inside. Many apples drop prematurely.
Maggots cannot be killed after apples are infested. Protect healthy apples from adult flies by applying an insecticide labeled for this pest, following label directions. Pick up and destroy fallen apples every week throughout the summer. Red ball traps can be used to control apple maggots without spraying. Hang at least 2 in each tree.