Overwinter as diapausing larvae, and pupate in spring. Adult female moths lay eggs on and near apple/pear fruit and larvae tunnel within fruit and feed on the seeds. Two-three generations/season.
Frass at entry/exit hole; tunneling in fruit fresh around seeds; early fruit drop.
- Non-mating disruption: Follow USU Extension biofix model to predict timing of first egg hatch, or hang pheromone trap with standard (1x) codling moth lure at first pink or 100 degree days after March 1 to record date of first moth flight (called biofix, when first moth has been caught). Continue to monitor trap in orchard and determine weekly moth count to monitor population throughout the season.
- Mating disruption: Follow USU Extension biofix model, or hang pheromone trap with CM-DA Combo lure at first pink or 100 degree days after March 1 in backyard tree or non-mating disrupted area close to orchard to determine biofix date. Continue checking trap weekly and treat when threshold is reached.
- Non-mating disruption: no threshold; usually treatment is needed throughout the season to protect fruit.
- Mating disruption: treat when 10 total moths, or 1 female moth, have been trapped using the CM-DA Combo lure. Restart threshold for each generation and after an insecticide treatment.
Degree Day Model
- Lower threshold: 50°F
- Upper threshold: 88°F
- Biofix: first trap catch
|1% egg hatch||220|
|period of greatest egg hatch||340-640|
|100% egg hatch||920|
|1% egg hatch||1100|
|period of greatest egg hatch||1320-1720|
|100% egg hatch||2100|
|1% egg hatch||2160|
Maintain proper sanitation by removing apple bins and removing/mowing fallen fruit.