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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).
Worms can infect the apples at any stage of development. Malus domestica, the standard apple tree, grows in U.S. Department of Agriculture hardiness zones 4 through 8, depending on the variety. All apple trees are susceptible to worm infestations, which can lower fruit production.The worms come from the codling moth that breeds in warm temperatures. In a mild or Mediterranean climate, several generations of moths can grow in one season.he adult moth lays the eggs on the leaves and fruit of the apple tree. She lays 30 to 70 eggs at a time. The oval eggs are flat and shaped like tiny disks.