University of California
Sacramento Valley Integrated Pest Management Update

May 3, 2024

Disclaimer: Pests/natural enemies’ activities and abundance updates provided on this site are for reference purpose only. Information provided here do not replace or supersede your orchard site-specific pest activity and abundance data. For optimal pest management decision support and treatment efficacy, use data and observations specific to your orchard.

See below the table for additional information on traps and lures used for monitoring in these locations.

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Additional pest management information is available at the UC IPM website, including a day degree calculator that can be tailored to your specific orchard location. Please contact Sudan Gyawaly at sgyawaly@ucanr.edu if you need more information on this report.

AVG. DEG. DAYS/DAY represents 7-day average degree day accumulations from the most recent trap check date listed at the top of each data table.

ACTIVITY (#/TRAP/DAY) represents the number of moths or eggs/trap/day for the 7-days from the most recent trap check date listed at the top of each data table.

Codling moth traps in walnuts include plastic delta sticky traps (Suterra) baited with Suterra CM Biolure®.

Navel orangeworm (NOW) monitoring includes the following trap-lure combinations:

1. Adult traps (delta sticky traps) for MALE moths are baited with Suterra NOW Biolure®.
2. Adult traps (wing sticky traps) for FEMALE moths are baited with Peterson Trap Company bait bags.
3. Egg traps (Suterra) are baited with Trécé Pherocon® NOW almond meal.

Peach twig borer (PTB) traps in almond include plastic delta sticky traps (Suterra) baited with Suterra PTB Bioloure®.

Oriental fruit moth (OFM) traps in almonds and peaches include plastic delta sticky traps (Suterra) baited with Suterra OFM Bioloure®.

*Note that established phenology (degree-day) models for NOW are based on egg trap data only currently.

We gratefully acknowledge financial support from the California Walnut Board, and the Almond Board of California.

Pest monitoring tools to monitor the pests mentioned in this report are manufactured by multiple companies. Mention of a brand name in this report is for educational purpose only and does not constitute recommendation or endorsement by the authors or the University of California.