Problem: Apple Maggot
Rhagoletis pomonella These worms, also known as railroad worms or apple fruit flies, are the larvae of flies that resemble the common housefly. Apple maggots infest plums, cherries, and pears as well as apples. Adult flies emerge from pupae between late June and the beginning of September. They lay eggs in the fruit through holes they puncture in the skin. The maggots that emerge from the eggs make brown trails through the flesh as they feed. Infested apples usually drop to the ground. Mature maggots emerge from the apple and burrow in the soil to pupate. They remain in the soil through the winter and emerge as adult flies the following June.
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.