GrowingHQ
PestFruit

Codling moth

The caterpillar in the core. A moth lays on developing fruit in early summer, the larva tunnels to the centre, feeds, and leaves through a hole packed with brown frass. The damage is complete long before anyone notices the fruit.

Caused by: Cydia pomonella · also called apple maggot

What brings it on

Adults fly on warm still evenings from around late May, and warm dry summers produce heavier attacks. Larvae overwinter in cocoons under loose bark and in debris around the tree.

source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Codling moth
  • UC Statewide Integrated Pest Management Program — University of California Agriculture and Natural Resources: Codling moth — life cycle

Checked 2026-08-13

Usually seen: May, June, July, August

Preventing it

Ordered by how much difference each measure actually makes, not by how often it is repeated.

  • Hang pheromone traps from late spring. On a garden scale their main value is telling you when the moths are flying, and they catch enough males on one or two trees to reduce damage.
    Sourced guidanceDepends on conditionshigh confidence

    Applies when: Effective for monitoring on any scale; the trapping effect on damage is reported for small numbers of trees rather than orchards.

    • Royal Horticultural Society: Codling moth — control

    Checked 2026-08-13

  • Encourage birds and remove loose bark and debris around the base, where the larvae overwinter.
    source

    Horticultural consensusmoderate confidence

    • Garden Organic — Garden Organic (Henry Doubleday Research Association): Codling moth — cultural control

    Checked 2026-08-13

Dealing with it once it is there

  • Pick up and destroy fallen fruit through the summer. Each dropped apple usually contains a larva that would otherwise complete its life cycle beside the tree.
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Codling moth

    Checked 2026-08-13

  • Accept some damage. A garden tree produces more apples than a household eats, and cutting round a tunnel costs less than any control programme worth running.
    source

    GrowingHQ editorial positionmoderate confidence

    A threshold judgement rather than a claim about the insect.

    • GrowingHQ editorial synthesis — GrowingHQ

    Checked 2026-08-13

What it affects

On sprays and treatments

GrowingHQ does not tell anyone what to apply, at what rate, or how often. Pesticide approvals differ by country, change without notice, and the product label is legally binding — it is also the document you are holding. What is described here is cultural and physical control, which is what a home grower can act on without a label in front of them.