If using insecticides, follow the label instructions and where applicable, observe preharvest intervals. Natural enemies, such as syrphid flies, ladybird beetles, and lacewings, sometimes adequately control apple aphids. Codling moth , Cydia pomonella Caterpillars of the codling moth damage the quince. This moth is one of the three most destructive apple insects that feed directly on quince. Pinkish caterpillars that have overwintered under bark or debris form pupae in spring.
Females emerge around bloom to lay eggs on fruit.
Caterpillars of the first of the two generations enter the fruit shortly after the blossoms fall. Those of the second generation injure fruit in August and September. The amount of damage varies greatly from year to year. Caterpillars of the codling moth are distinguished from those of other boring caterpillars by having a dark brown anal comb at the rear of the body and by tunneling directly to the core of the fruit. Pheromone traps may be used to monitor adult flights.