Fruitlet-mining tortrix moth caterpillars occur in early summer at the same time as those of the apple sawfly, but they feed in the centre of a cluster of apples and are covered in a web. Their tunnels wander around the surface of the fruitlet instead of going into the core, and they make puncture marks rather than corky scars. Both caterpillars and sawflies have true legs and sucker-like legs, but caterpillars have a gap between the two.