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Codling Moth

 

Codling moth damage Codling moth

Hosts:  apple, pear


Biology:
  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. 


Symptoms/Damage:
  Frass at entry/exit hole; tunneling in fruit fresh around seeds; early fruit drop.


Monitoring:
 

  • 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.


Treatment Threshold:

  • 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
Event Degree Days
First Generation
  1% egg hatch 220
  period of greatest egg hatch 340-640
  100% egg hatch 920
Second Generation 
  1% egg hatch 1100
  period of greatest egg hatch 1320-1720
  100% egg hatch 2100
Third Generation 
  1% egg hatch 2160

 

Management Considerations:  Proper timing of insecticides is important.  Utah offers spray timing dates, Colorado offers fruit information, and Idaho offers the Pacific Northwest Pest Alert Network

Maintain proper sanitation by removing apple bins and removing/mowing fallen fruit.