Roger Duncan - Pomology Advisor
Title:
Farm Advisor
Specialty:
Almonds, Peaches, misc. tree fruit
Address:
3800 Cornucopia Way, Suite A
Modesto, CA 95358
Phone: (209) 525-6800
Fax: 209-525-6840
Email: raduncan@ucanr.edu
Field Trial Links:
Duncan Pruning Spacing 2022 Final Report
22.23 RAVT Research Report Final
4th Gen RAVT 2023 annual report final
Almond Rootstocks final report 1-23
Annual Report Duncan Compost 2019
Do Honey Bees Increase Set and Yield of Self-Fertile Varieties Final Report
Cal Ag ground water recharge article
New Rootstock Tools:
Online Almond Rootstock Database
Online Almond Rootstock Comparison Tool
Almond Rootstock Comparison Chart
Almond Rootstocks Video - Summary of Westside Stanislaus County Field Trial
Regional Almond Variety Trial Video 2022
Publications:
Presentations from Previous Workshops:
North San Joaquin Valley Almond Days
North San Joaquin Valley Cling Peach Seminars
Other Slide Show Presentations
Almond Leaf & Tissue Sample Models:
Copy of Model for Early Season Leaf Sampling
Model for Interpretation of Early Season Tissue Sampling
Other Important Websites:
Weather
Linked data is from the California Irrigation Management Information System (CIMIS) weather stations. Visit CIMIS web site.
Stanislaus County Stations
The Scoop on Fruits & Nuts
Produced by Roger Duncan, Pomology and Viticulture Advisor, Stanislaus County. You can receive email notification when the next newsletter is posted.
| Issue | Articles | Type |
|---|---|---|
| Pacific Flathead Borer Field Day | Pacific flatheaded borer (Chrysobothris mali, Family Buprestidae) has become an increasing pest problem in walnut orchards in the last decade. The adult (beetle) lays eggs on the branches, and larvae feed on the cambium layer, weakening and wilting the branches. In addition to tree stress from environmental factors, high heat in the summer months exacerbates the problem – we observed a high incidence of this in the 2024 season.
In the last 5 years, we have been researching this pest's biology and seasonal phenology and developing monitoring and management strategies. In the field meeting, we will share IPM information about this pest. Also, demonstrate how to identify the pest and its damage symptoms in the orchard.
2-hour DPR and CCA credits have been approved. Please register to join the field meeting on Thursday, November 21, 2024 | |
| A visual guide to identifying invasive carpophilus beetle damage in almonds: differentiating carpop |
| |
| Carpophilus Extension Event | “The carpophilus beetle California workgroup is organizing a Zoom webinar on July 9, 3-6 pm to inform California’s nut crop growers and industries about the newly invasive pest. In this webinar, we coordinated with research scientists, growers, and industry professionals from Australia to share their knowledge and experiences dealing with the carpophilus beetle in the last 10 years. I hope you will be able to join this informational session.
Please register using this link: https://ucr.zoom.us/webinar/register/WN_VQNkKaG5Tyu97IuLz7XN-A#/registration |
