How to Manage Pests

UC Pest Management Guidelines


Pheromone Traps

(Reviewed 11/12 , updated 11/12 )

In this Guideline:

In pears, pheromone traps are used to monitor adult emergence and flights of codling moth and obliquebanded leafroller. Consperse stink bug pheromone traps monitor both adult migration into the orchard and the population cycle within the orchard.

Use the information obtained from the trap catches in conjunction with degree-day calculations (codling moth and obliquebanded leafroller) to schedule control actions. The traps are used to establish a biofix, which is an identifiable point in the life cycle of the pest at which you can begin degree-day accumulation. For example, the biofix for codling moth is the first date that moths are consistently found in traps for three consecutive days and sunset temperatures have reached 62F.


  • Use a minimum of one trap per 5 acres for both regular (1 mg) and supercharged (10 mg) traps.
  • Check traps twice a week until the biofix is established; thereafter, check traps weekly.
  • Remove trapped insects from the trap after you count and record results (example formPDF).
  • For moth traps, replace trap bottoms monthly or when they become covered with debris.
  • Follow manufacturer's recommendations for replacing pheromone lures.Store pheromone lures in a refrigerator or freezer.

WHEN TO PUT OUT PHEROMONE TRAPS (consult individual pest section for best placement of trap)

Pest When Placement Importance
Codling moth Regular 1 mg pheromone plus DA lure traps
  • Delta Region: early March
  • North Coast areas: late March
  • Sierra Foothill: late March to early April
6 to 8 ft high
  • To determine biofix early in the season and follow development
  • To time when to deploy pheromone mating dispensers
  • To determine after biofix whether mating disruption is working
Supercharged 10 mg pheromone plus DA lure traps: at biofix Top 1/3 of canopy
  • To monitor population in pheromone-treated orchards
Obliquebanded leafroller Mid-April 6 to 8 ft high
  • To monitor overwintering flight and to time treatments
Consperse stink bug Early April  
  • To determine if adults are migrating into the orchard
  • To follow seasonal development of population



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Pear
UC ANR Publication 3455

General Information

L. G. Varela (Crop Team Leader), UC IPM Program, UC Cooperative Extension Sonoma County
R. B. Elkins, UC Cooperative Extension Lake County
R. A. Van Steenwyk, Insect Biology, UC Berkeley
C. Ingels, UC Cooperative Extension Sacramento County
L. R. Wunderlich, UC Cooperative Extension El Dorado County

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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