How to Manage Pests
UC Pest Management Guidelines
Pear
Pheromone Traps
(Reviewed
11/12
, updated
11/12
)
In this Guideline:
|
|
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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 62ºF.
GENERAL GUIDELINES FOR USING PHEROMONE TRAPS
-
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 form—).
-
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
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IMPORTANT LINKS
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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