Walnut News

Walnut News & Fruit For Thought Newsletter

Issue Articles Type Date Added
COVID-19 Notification

Please see the attached link concerning our office and the COVID-19 outbreak.

PDF 3/25/20
IPM Breakfast Meeting Cancellation 3/18 & 4/1

Due to the threat of the corona virus that causes COVID-19, University of California employees have been ordered to temporarily cancel all face to face educational events, regardless of size.  In addition, President Trump has advised against meeting in groups of more than 10 people and avoiding restaurants.  Therefore Jhalendra, Kari and I will cancel our March 18 and April 1 Tree & Vine IPM breakfast meetings.  We will monitor the situation closely and will make a decision on future meetings as the situation unfolds. 

Best wishes,


Roger Duncan

Pomology Advisor and Director

UC Cooperative Extension, Stanislaus County





PDF 3/17/20
IPM Breakfast Meetings

2020 Tree and Vine IPM Update Breakfast Meetings

Roger Duncan, Kari Arnold, and Jhalendra Rijal will continue to host the IPM breakfast meetings. These free meetings are open to all interested fruit and nut growers, consultants, and pest control advisors for a casual discussion on current insect pest populations, disease problems, and methods of control. We are looking forward to seeing you there.

  • March 4, 2020 - Spring Pests & Diseases of Trees and Vines 
  • March 18, 2020 - Laws and Regulations 
  • April 1, 2020-TBD
  • April 15, 2020-TBD
  • May 6, 2020-TBD
  • May 20, 2020-TBD
  • June 3, 2020-TBD
  • June 17, 2020-TBD
PDF 2/25/20
Spray Application Pest Management Alliance Airblast Sprayer Calibration Training

We will be holding a training aimed at applicators, growers, and PCAs who work in vineyards-to be held on February 20, 2020, at Kautz Farms in Lodi.

The registration link is http://ucanr.edu/SprayAppLodi/ 

Please see attached link for more information. 

PDF 1/28/20
California Cherry Research Review

Wednesday, January 22, 2020
9:00 a.m. - 1:30 p.m.

San Joaquin County – Office of the Agricultural Commissioner
Evelyn Costa Assembly Room
2101 E. Earhart Avenue, #100, Stockton, California 95206
Sponsored by the University of California and California Cherry Board

9:00 Welcome
Scott Brown, Production Manager, Morada Produce
Tyler Rood, California Cherry Board
9:10 The investigation into dormancy breaking agents and the dynamic chill portions model in CA cherries via carbohydrates and solar radiation
Dr. Kari Arnold, UCCE Orchard and Vineyard Systems Advisor, Stanislaus County
9:30 Cherry buckskin disease review: x-disease phytoplasma
Dr. Mohamed Nouri, UCCE Orchard Systems Advisor, San Joaquin County
10:00 Measuring cherry evapotranspiration and deriving crop coefficient (Kc) values for use in irrigation scheduling
Dr. Kosana Suvocarev, Dept. of Land, Air & Water Resources, UC Davis
10:20 Engineered transgenic Drosophila suzukii for wild population suppression & eradication: production, performance assessment and effective wild releases Dr. Nikolay Kandul, Div. of Biology Sciences, UC San Diego
10:50 Break
11:10 Improved management of fungal canker diseases of sweet cherry
Investigating the cause of sudden decline of sweet cherry in California
Dr. Renaud Travadon, Dept. of Plant Pathology, UC Davis, Kearney Agricultural Research & Extension Center, Parlier, CA
12:00 Management and epidemiology of pre- and postharvest diseases of sweet cherry
Dr. James Adaskaveg, Dept. of Plant Pathology, UC Riverside
12:30 Lunch (Courtesy of California Cherry Board)
1:30 Adjourn

PDF 1/21/20
2020 SJV Grape Symposium!

2020 SJV Grape Symposium

Wednesday, January 8,

C.P.D.E.S Hall, Easton CA

7:00 AM    Registration and Refreshments
7:50 AM Morning Welcome
12:00 PM   Lunch sponsored by Raisin Bargaining Association and Sun-Maid Growers of California

Continuing Education: 3.0 PCA and 3.5 CCA hours have been requested.

Any questions? Email George Zhuang at: gzhuang@ucanr.edu or call the office number (559) 241-7506

2020 SJV Grape Symposium Agenda

Mail In Registration Form 2020


PDF 1/6/20
San Joaquin Valley Spray Application Short Course

San Joaquin Valley Spray Application Short Course
November 12-14, 2019
Kearney Agricultural & Research Extension Center

Join us for this intensive 3-day short course on spray application research and extension, led by UC Cooperative Extension Specialist Peter Larbi.


  • Teach participants about improving agricultural productivity while reducing the impact of pesticides and other agricultural chemicals on the environment.
  • Share knowledge of best practices for safe, economical, and environmentally sound pesticide spray application.

$400 registration fee includes two in-classroom lecture days and one outdoor, hands-on demonstration day as well as materials and most meals. The full agenda can be found here.

This event is open to the public. Please share broadly with your clientele or anyone who may be interested in attending.

UC Agriculture and Natural Resources | San Joaquin Valley Spray Application Short Course, Nov. 12-14 at Kearney REC

Register today to attend the San Joaquin Valley Spray Application Short Course, November 12-14, 2019 at the Kearney Agricultural Research and Extension Center.

Join us for this intensive 3-day short course on spray application research and extension, led by CE Specialist Peter Larbi. Includes two in-classroom lecture days and one outdoor, hands-on demonstration day.


  • Teach participants about improving agricultural productivity while reducing the impact of pesticides and other agricultural chemicals on the environment.
  • Share knowledge of best practices for safe, economical, and environmentally sound pesticide spray application.

Register online before October 22 for the $750 Early Bird price.

Continuing Education credits from California Department of Pesticide Regulation and California Crop Advisors have been applied for and are pending approval.

Interested in becoming a Sponsor? Please complete the Sponsorship Form.


Contacts for more information:
Logistics and Registration – Julia Kalika, Program and Events Specialist, anrprogramsupport@ucanr.edu 530-750-1380

Course Content – Peter Ako Larbi, Assistant Cooperative Extension Specialist

PDF 9/26/19
Summer 2019 Issue

In this issue...

  • Walnut Blackline
  • Howard Fallen Nuts
  • Grapes
  • Cherries
  • Apricots
PDF 7/16/19
Meeting Notice: Honoring Larry Williams - A Program Focused on Vineyard Water Management

Save the Date: Thursday, April 18, 2019

Where: UC Davis Conference Center

When: 9:00am to 5:00pm

18-19 - Honoring Larry Williams: A Program Focused on Vineyard Water Management

Professor Larry Williams retired from UC Davis in June 2018 after 36 years in the Department of Viticulture and Enology.  Please join us for a special seminar, honoring Larry, focused on irrigation and water management, topics near and dear to Larry’s heart. The day will consist of presentations focused on the latest research regarding optimal vine water management, a grapevine water status technology panel, and a vineyard management panel. The day will conclude with a keynote lecture from Emeritus Professor Larry Williams.   This is a who’s who of water management and irrigation, a program not to be missed!

Please join us after the program for a wine and cheese reception in Larry’s honor. This is the perfect opportunity to interact with Larry and all of the speakers.


PDF 4/5/19
Walnut Nitrogen and Irrigation Management Field Day

10:00 AM – 12:15 PM

9:30 AM – 10:00 AM Registration and Coffee

10:00 AM – 12:15 PM 30-Minute Rotating Stations

1. Results from Walnut Field Study on Nitrogen Movement Past the Root Zone
Michael L. Johnson, Ph.D., MLJ Environmental

2. The Science and Art of Efficiently Fertigating with Nitrogen and Other Crop Nutrients
William D. Jones, Agricultural Consultant, CURES Agronomist

3. Nitrogen Fertigation Equipment and Operation
William C. Green, Center for Irrigation Technology (CIT), CSU Fresno

4. Walnuts and the 4Rs for Nitrogen Management: Right Time, Place, Amount and Product
Katherine Jarvis-Shean, Ph.D., University of California Cooperative Extension

12:15 PM – 12:30 PM Sign out and Certificate Distribution

2 hours Continuing Education Units for self-certified growers
Please email register@curesworks.org or call (916) 798-8003 to RSVP


PDF 3/27/19
San Joaquin Valley Weed Days in April

Good Afternoon


There are two scheduled San Joaquin Valley Weed Days in April (4/2 and 4/11). Please see link at the bottom of this email for more information.


Thank you

PDF 3/11/19
UCCE Stanislaus County IPM Breakfast Meetings resume March 6

Good afternoon

Our University of California Cooperative Extension Tree & Vine IPM Breakfast meetings will begin again next Wednesday, March 6.  These informal discussions focus on real-time insect and disease issues and their management.  They are held every first and third Wednesday morning from March through June from 7:00 a.m. – 8:00 a.m. at the Old Mill Café, 600 9th Street in Modesto.  One hour of continuing education credit is offered at each meeting.  There is no charge – just buy your own breakfast and tip the waitress!  If you have questions or would like to sponsor the $45 fee for CE credits, please call our office at 209-525-6800.


Best wishes,


Roger Duncan
Pomology Advisor and Director
UC Cooperative Extension, Stanislaus County

ANR Catalog

PDF 3/1/19
Grapevine Production Short Course

Grapevine Production Short Course

February 12-15, 2019
Springhill Suites Napa, CA and Oakville Experimental Vineyard Oakville, CA 
UC Davis

Plan to join us for this integrated vineyard management short course featuring UC faculty, Cooperative Extension specialists and farm advisors, and USDA researchers who will provide an in-depth, comprehensive study of all phases of grapevine culture and production.

The program is based on the latest information and research and will cover the fundamental principles that form the basis for practical decisions and include Q&A for each session, quality time with instructors and networking opportunities.
Who should attend: New and experienced growers as well as other industry members interested in commercial grape production.


$1200 Registration Fee Includes

  • Four full days of instruction with hands-on demonstrations in the vineyard
  • Transportation to Oakville Experiment Station
  • An electronic binder of all presentations
  • DPR (PCA) & CCA credits (pending approval) 
  • Breakfast, lunch, and refreshments all four days of the course

Register to learn more about:

  • Vineyard planning, design, and development
  • Grapevine variety and rootstock selection
  • Evaluation and modification of water and soils
  • Grapevine training, pruning and canopy management
  • Physiology of the grapevine 
  • Irrigation scheduling
  • Proper use and maintenance of irrigation systems
  • Mineral nutrition and fertilization
  • Management of weeds and vertebrate pests
  • Integrated pest manage
PDF 1/18/19
Walnut News January 2019

Contents of Walnut News Newsletter:

Quad-County Walnut Institute
February 5, 2019


PDF 1/10/19
2019 San Joaquin Valley Grape Symposium

Hello All,


The 2019 San Joaquin Valley Grape Symposium will be held at the CPDES Hall in Easton, CA on January 9, 2019.

Please see agenda for more information.  To register online and pay by credit, click here.

Cost: $15.00 includes meeting, proceedings, and lunch.

$20.00 at the door - cash/check only, as the facility does not have the ability to take credit cards. Late fee does not include lunch or proceedings.

Hope to see you there!

PDF 12/3/18
Advances in Walnut Production Short Course

Good morning


The University of California Agriculture and Natural Resources and Cooperative Extension is pleased to announce the upcoming Walnut Production Short Course. Over the course of three days, you will learn the latest in research and information involving walnut culture and production. Please see the following link for more information and registration:




Thank you 


Kari Arnold

UCCE Area Orchard and Vineyard Systems, Stanislaus County

3800 Cornucopia Way, Suite A Modesto, CA 95358

Office: (209) 525-6800

email: klarnold@ucanr.edu

PDF 9/18/18
2018 Western Pecan Production Short Course, hosted by New Mexico State University in Las Cruces, NM

Short course features:

Three full days in the “classroom” with lectures to cover horticulture, pest control, economics, and related aspects of pecan production from start to finish, plus a full-day field trip to pecan farms.


Cost: $300 short course only, $400 short course and field trip

PDF 7/23/18
Tree Fruit Orchard Tour

This tour will explore the use of harvest aids and mechanization for improving efficiency and reducing labor costs in tree fruit production. We will travel to several orchards to see and discuss trellis systems and platforms for harvesting and managing pear, cherry, and apple orchards. Researchers from Washington State University will share results of their work with harvest-assist machines and their effects on productivity, efficiency, and bruising. Researchers and growers will discuss lessons learned from trellis designs and spacing that facilitate mechanization and maximize efficiency.


Special Guests: Matt Whiting (WSU Extension Horticulturist) and Karen Lewis (WSU Tree Fruit Specialist) Organized by UC Cooperative Extension Funding: Calif. Apple Commission, Calif. Cherry Advisory Board, and Calif. Pear Advisory Board 

PDF 6/1/18
Walnut Pruning Trial Field Day

Agenda for Walnut Pruning Trial Field Day

PDF 5/8/18
Walnut News & Fruit for Thought

Spring Issue of Walnut, Grapes, Apricot, and Cherry news. 

PDF 4/13/18
2018 Quad County Walnut Day

Agenda for the 2018 Quad County Walnut Day

PDF 2/12/18
February 2015
  • 45th Annual Quad-County Walnut Institute, Thursday, March 12
  • Ground Squirrels
  • Orchard Sanitation
PDF 2/24/15
August 2014
  • Codling Moth Management Meeting
      Thursday, August 14, 2014
  • Field Meeting - Identifying & Managing Bot Dieback in Walnuts
       Thursday, August 21, 2014
PDF 7/30/14
February 2014
  • 44th Annual Quad County Walnut Institute
    Thursday, March 6, 2014 / 8:00 a.m. - 12:30 p.m.
    San Joaquin County Ag Center / Evelyn Costa Assembly Room
    2101 E. Earhart Ave., Stockton, CA 95206 
  • Tree & Vine IPM Breakfast Meetings
    1st & 3rd Wednesdays, March - June
    Old Mill Cafe
    600 9th St., Modesto
    starting March 5, 2014
    7:00 - 8:00 a.m.
  • Orchard Compaction
  • Tree Planting
  • Scale Pests
  • Naval Orangeworm (NOW)
PDF 2/14/14
43rd Annual Quad-County Walnut Institute PDF 1/29/13
Tree & Vine IPM Update Breakfast Meetings PDF 4/12/12
February 2012

* Quad County Walnut Institute
* Orchard Compaction
* Tree Planting
* Scale Pests

PDF 1/9/12
Low Emissions Nut Harvesting Field Day PDF 9/30/11
February 2011 Quad-County Walnut Institute Meeting PDF 2/10/11
July 2009 Ag Technology Field Day & Irrigation & Trade Show Meeting PDF 7/13/09
March 2009 *Tri-County Walnut Institute 03/17/09 *Walnut Blight *Coddling Moth *Ground Squirrels *Orchard Sanitation *Newly Planted Tree Care *Zinc *Pest Hotline *IPM Update Breakfast Meetings Resume PDF 3/2/09
August 2008 Walnut Grower Field Day 08/18/08 DOC 8/8/08
Tree & Vine 24 Hour Pest Phone Hotline The latest development updates on key tree & vine pests. DOC 6/4/08
February, 2008 Walnut News PDF 2/15/08
Tree & Vine IPM Update Breakfast Meetings March 1 - June 21, 2006 DOC 6/27/11
36th Annual Tri-County Walnut Institute DOC 6/27/11
9th ANNUAL NUT INDUSTRY EXPO Stanislaus County Fairgrounds Wednesday, November 9th, 2005 PDF 6/27/11
Fall 2005 Harvest and postharvest topics PDF 4/16/09
2005 Walnut Meeting 35th Annual Tri-County Walnut Meeting Friday, March 25, 2005 PDF 6/12/08