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Photo of Dr Kari L. Arnold
Dr Kari L. Arnold 
Title: Farm Advisor
Specialty: Walnuts, Cherries, Grapes and Apricots
University of California Cooperative Extension, Suite A. Corner of Service and Crows Landing
3800 Cornucopia Way
Suite A
Modesto, CA 95358
Phone: 209-525-6821 

Kari Arnold joined UCCE as an area orchard and vineyard systems advisor in Stanislaus County on Nov. 1, 2017.

Prior to joining UCCE, Arnold was a postdoctoral researcher in the Department of Plant Pathology at UC Davis, where she participated in a statewide extension and outreach program involving viruses in grapevines and the certification program, collaborated with county viticulture advisors and industry leaders to facilitate grower workgroups for regional management of grapevine viruses, and provided presentations at grower meetings.

As a graduate student researcher from 2011 to October 2016, Arnold participated in individual grower meetings and surveys, facilitated and collaborated with a grower workgroup for areawide disease management in Napa vineyards, and conducted statistical characterization of spatial and temporal patterns of insect-vectored plant viruses. From 2009 to 2011, Arnold also worked as a staff research associate and nursery technician for Foundation Plant Services at UC Davis, where she provided employee training; worked on team oriented projects; provided tours, conducted virus indexing, and collected and analyzed data.

Arnold completed an M.S. and a Ph.D. in plant pathology from UC Davis and a B.S. in horticulture from the University of Nebraska – Lincoln.


Fruit and Nut Chill Accumulation/Harvest Prediction Calculation
Information about Pomology Weather Services

Estimating Soil Moisture by Feel and Appearance
Information here: Estimating Soil Moisture

Click here for Walnut News

View Presentations from Previous Workshops:

2019 UCCE IPM Seminar - San Luis Obispo

49th Annual Quad-County Walnut Institute

Drip/Micro Irrigation Meeting 08-04-09


Quad County Walnut Institute 2014 Talks


Walnut News & Fruit For Thought Newsletter

Issue Articles Type Date Added
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