How to Manage Pests
UC Pest Management Guidelines
In this Guideline:
Pheromone traps are used to
monitor the flights of certain pest moths and San Jose scale. Use pheromone
traps to monitor San Jose scale and obliquebanded leafroller in all orchards.
Only orchards that did not receive a dormant or bloom treatment, or are for
fresh market sale, require peach twig pheromone traps. Codling moth traps are
needed only in those few orchards with a history of codling moth infestations.
The information obtained
from trap catches can be used to schedule control actions when used in
conjunction with degree-day calculations. The traps are used to establish a
biofix—an identifiable point in the life cycle of the pest at which you can begin
degree-day accumulation or take a management action. For example, the biofix
for peach twig borer is the date that the first adult moth of each generation
GENERAL GUIDELINES FOR USING PHEROMONE TRAPS
- Place traps in each orchard for which you need to
make pest management decisions.
- Traps should be placed in orchards by the dates
indicated in the table below.
- Use at least 2 traps per block for moths, and 3 or
4 per block for San Jose scale.
- Distribute the traps uniformly throughout the
orchard and use the same locations each year.
- Place additional traps in hot spots.
- Hang traps 6 to 8 feet high, 1 to 3 feet inside
the canopy in the north quadrant of the tree, in the shade, and at least 5
trees in from the edge of the orchard.
- Check traps twice a week until the biofix is
established; thereafter, check traps weekly.
- Remove trapped insects from the trap bottom after
you count and record the trap catch on a monitoring
- Replace trap bottoms monthly or when they become
covered with debris.
- Follow manufacturer's recommendations for
replacing pheromone dispensers.
- Store pheromone dispenser in a refrigerator or
WHEN TO PUT OUT TRAPS
||Trap placement date
|San Jose scale
||Determine biofix; excellent for monitoring beneficials.
|peach twig borer
||March 20 (San Joaquin Valley)
April 1 (Sacramento Valley)
|Determine biofix for each generation; use degree-days to determine caterpillar monitoring schedule.
||Determine biofix for each generation; use degree-days to determine spray timing.
||Monitor biofix and look for caterpillars for treatment between 900-1000 degree-days.
UC IPM Pest Management Guidelines: Prune
UC ANR Publication 3464
C. Pickel, UC IPM Program,
F. J. A. Niederholzer, UC Cooperative Extension, Sutter/Yuba counties
W. H. Olson, UCCE Butte County
F. G. Zalom, Entomology, UC Davis
R. P. Buchner, UC Cooperative Extension, Tehama County
W. H. Krueger, UC Cooperative Extension Glenn County
Acknowledgment for contributions to Insects and Mites:
W. O. Reil, UC Cooperative Extension Solano/Yolo counties.
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