Newly hatched larva (one per fruit) burrow through skin into the flesh and through to the core.
- The entry point is often at the calyx (smaller fruits) or on the cheek (larger fruits).
- The entry hole is prominent and red-ringed, characteristically blocked by dry frass.
- Cut open fruit to reveal cavity, frass and sometimes the larva.
- Damaged fruits often fall prematurely and are found on the ground under the tree.
Other pests with which codling moth may be confused
Fruitlet mining tortrix
Larval attacks by the fruitlet mining tortrix occur shortly after blossom.
Blastobasis decolorella
Caterpillars sometimes burrow into fruits from July-September, but damage is usually associated with extensive surface damage.