Codling Moth- Holes in Apples

A moth that damages Apples, Walnuts, Pears and other fruits around the world. The larval (worm) phase of its life burrows into the fruit causing extensive damage and rendering the affected fruit inedible.

Identification

Usually an entrance hole can be seen on the outer layer of the fruit and often parts of the fruit will become sunken and rotten. Split the fruit open to see the tunneling and sometimes catch the larvae still inside.

Life Cycle

Codling moth overwinters as larvae inside a cocoon that is attached to bark. They pupate and emerge as adults in the spring. After they mate, females lay eggs on leaves which hatch into larvae that begin to feed on the leaves before burrowing into fruit. After they feed for 3-4 weeks, they move from the fruit to the tree to spin their cocoons. In Colorado, about 2/3 of these moths emerge to produce a second generation, whereas, the remainder go dormant and overwinter for the following season.

Damage

Damage is often extensive and will render the entire fruit crop worthless for eating. If fruit is not desired, treatment is not necessary as the pest does not affect tree health. Fruit suppression is also an option, but efficacy varies and results are inconsistent.

Management

A pesticide spray in the spring will reduce or totally eradicate infestations of this moth.