The fruit is blemished by small holes surrounded by dead tissue. A brown, crumbly material resembling sawdust may surround the holes. Brown-headed, pinkish white worms up to 1 inch long may be found in the fruit. The interior of the fruit is often dark and rotted. Affected apples drop prematurely.
Once worms have penetrated the apples, it is impossible to kill them. To protect uninfested apples, apply an insecticide labeled for this pest, following label directions. Remove and destroy all fallen apples and clean up debris. Pheromone traps can also be used to control codling moths. Hang at least two per tree.