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Figure 1. Tunneling of apple fruit caused by larvae of the codling moth. Codling moth is the most important insect pest of apple and pears in North America. Damage is done by the larvae, which are cream-colored caterpillars that tunnel fruit and produce âwormyâ apples (Figure 1).
This distinguishes it from other larvae commonly found infesting apples, such as the Codling Moth. But in fact, the maggot can be hard to spot, given its small size and the similarity of its color to the flesh of the apple.pple Maggot (Rhagoletis pomonella). The Apple Maggot Fly is named for its larvae, one of the most serious pests of apples in eastern North America, where it is a native species that originally infested hawthorns. Several closely related species attack cherries and blueberries.