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Dr Zheng Wang 
Vegetable & Irrigation Advisor
UCCE Stanislaus County
Postdoc - The Ohio State University
PhD - University of Kentucky
MS - Western Kentucky University
BS - Shenyang Agricultural University, China
Contact Me
3800 Cornucopia Way, Suite A  Modesto, CA 95358
209-525-6822 (O);
209-525-6840 (F)


Welcome to the UCCE Stanislaus County Vegetable Page. The purpose of this website is to generate and disseminate resources and tools for vegetable stakeholders in Stanislaus County to strengthen their vegetable production and business.

This site provides:

  1. Progress on our area of ongoing research and extension programs
  2. Descriptive photo galleries from different research and extension activities
  3. Various deliverables from our research and extension programs (newsletters, scientific reports, presentation slides, etc.)
  4. Tools that are built to strengthen stakeholders in decision making and troubleshooting

Stanislaus County Vegetable Crops Production

Vegetable production in Stanislaus County is historically diverse in commodities. According to the 2017 Stanislaus County Crop Report, vegetable crop production experienced significant increases in total harvested acreage (20%) and sales value (15%) compared to 2016, reaching totals of 28,630 acres and $180 million, respectively. Tomatoes (fresh market and processing), melons, and sweet potatoes continue to be the major commodities, constituting nearly 60% total acreage and sales value. Follow the link (http://www.stanag.org/crop-reports.shtm) to download the 2017 crop report and previous crop reports for more details. 

Plans for 2019

There are two major themes for the UCCE Stanislaus County vegetable crops program in 2019: Sustainable Practices and Plant Health.

Sustainable Vegetable Production:

  • San Joaquin County Vegetable Crops Advisor, Dr. Brenna Aegerter, Yolo County retired Vegetable Crops Advisor, Gene Miyao, and myself will begin the third year evaluation of grafted rootstock-scion combinations on processing tomato yield and quality in the northern San Joaquin Valley. We will assess the viability of grafting as a cost-effective tool to enhance processing tomato productivity.
  • I will test the effects of in-row spacing of grafted seedless watermelon on fruit yield, quality, and economic matrix in Turlock. I hope to find the optimal spacing (plant population) to make watermelon grafting more efficient and economically sound.
  • I will collaborate with crop biostimulant companies to evaluate a number of crop biostimulants on processing tomato productivity and plant nutrient management in Patterson. Crop biostimulants are rapidly-growing product lines receiving much attention, especially from sustainable vegetable folks.
  • I will also work with the Soil Nutrient and Health Advisor, Dr. Anthony Fulford and Dr. Costanza Zavalloni from CSU Stanislaus to figure out the influence of compost application rates on nitrogen management and processing tomato productivity and quality in Patterson.

Plant Health:

  • I will collaborate with other UCCE vegetable advisors to monitor the varietal responses to resistance-breaking tomato spotted wilt virus. I will scout processing tomato fields in our county for the disease occurrence especially the fields grown with resistant varieties. Meanwhile, I will also keep eyes on other vegetable diseases and pest issues to maintain healthy vegetable operations.
  • For leafy vegetables, I will work with the Western IR-4 and Ratto Bros in Modesto to conduct a field trial of testing the efficacy of a Sulfentrazone herbicide on the basil weed control. This will hopefully help with the process of herbicide registration to provide CA leafy vegetable growers more choices toward chemical weed control.

Stay tuned to the Veg View Newsletter with project updates.       

Veg Views Newsletter

Issue Articles Type Date Added
Second Grafted Watermelon Field Day

Grafted Watermelon Field Day
Friday, September 13, 2019, 9:00 to 11:00 a.m.
4866 Geer Road, Hughson, CA 95326
Free event open to the public
0.5 CCA Hours Pending

PDF 9/3/19
Summer 2019 Issue #2

In This Issue...

  • Watermelon Grafting Field Day
  • Herbicides on Basil
  • Plant Growth Chart
  • Biostimulants & Tomatoes


PDF 8/2/19
Grafted Watermelon Field Day

Grafted Watermelon Field Day
Tuesday, June 11, 2019, 8:00 to 11:00 a.m.
4866 Geer Road, Hughson, CA 95326
Free event open to the public
1.0 CCA Hours Pending

Vegetable grafting has become an increasingly important tool in commercial crop production. Vegetable growers and related communities are interested in maximizing benefits of grafted plants. Our field trial, kindly supported by Dan Avila & Sons, is testing the effects of plant population and various grafted combinations on watermelon yield and fruit quality to find a balance between cost (number of grafted plants per acre) and fruit yield and quality. Our guest speakers will present on the development of vegetable grafting and their experience with grafted plants. Attendees will get hands-on experience combining the two plants into one with grafting a watermelon plant. Light refreshments will be served throughout the field day.


Please R.S.V.P. to Dr. Zheng Wang
Email: zzwwang@ucanr.edu
Phone: 209-525-6822
by 6/7/2019

PDF 5/20/19
Spring 2019 Issue #1

2019 Research Projects

  • Processing Tomato
  • Watermelon
  • Leafy Greens


PDF 4/9/19
UCCE Northern San Joaquin Valley Processing Tomato Meeting

UCCE Northern SJV Processing Tomato Meeting
University of California Cooperative Extension Farm Advisors San Joaquin, Stanislaus, and Merced Counties
In conjunction with
The California Tomato Growers Association
72nd Annual Meeting & Exhibit
Thursday, January 31, 2019, 8:00 - 11:00 am
Modesto Centre Plaza/DoubleTree Hotel, 1000 L St, Modesto, CA, 95354

PDF 1/8/19
Summer 2018 Issue #3
  • Recent Happenings
  • Labor Shortage Solutions
  • Cover Crop Considerations
PDF 9/12/18
Grafted Fresh Market Tomato Field Day

University of California Cooperative Extension
Grafted Fresh Market Tomato Field Day


  • Farmington, CA
  • Friday, July 27th, 2018
  • 9am to noon, come and go as you wish
  • This event is free and open to the public
  • Boxed lunches. Please RSVP to Brenna (bjaegerter@ucanr.edu) by July 24th
PDF 7/16/18
Summer 2018 Issue #2

This issue of Vegetable Views talks about:


  • June Vegetable Walk
  • Calculate Fertilizer Need
  • Upcoming Events
PDF 7/12/18
Summer 2018 Issue #1 PDF 5/30/18
Spring 2018

Spring 2018 Veg Views Newsletter



  • New Advisor Introduction
  • Tomato Spotted Wilt Virus
PDF 4/23/18
News Release - Tomato Spotted Wilt Virus

University of California Cooperative Extension Vegetable Crop Advisor Zheng Wang's news release on Tomato Spotted Wilt Virus. 

PDF 4/18/18
January 2010 Processing Tomato Production Meeting PDF 3/15/18
July 2009 *53rd Weed Day July 16, 2009 *Spinach & Other Vegetables as New Hosts of Impatiens Necrotic Spot Virus *Neonicotinoid Insecticide Products to be Re-Evaluated by CDPR PDF 7/1/09
Processing Tomato Field Day 09/30/08 Mid-Season Processing Tomato Variety Trial Field Day 9:30 - 11:00 a.m. Tues. Sept. 30th DOC 9/22/08
2007 Tri-County Bean Production Meeting Tri-County Bean Production Meeting Thursday, March 8, 2007 8:30-12:00 Jorge's El Tapatio Mexican Restaurant 572 W. 11th Street, Tracy, CA DOC 2/23/08
2006 Report Stanislaus County Processing Tomato Variety Trial Report. This report can also be found on the Vegetable Crop Advisor's page of UCCE Stanislaus's web site. (http://cestanislaus.ucdavis.edu/Agriculture/Vegetable_Crops.htm) PDF 2/8/08
September, 2006 2006 Mid-Season Processing Tomato Field Day DOC 6/27/11
January 2006 2006 Northern San Joaquin Valley Processing Tomato Production Meeting PDF 6/27/11
August 2005 UCCE Regional Fresh Market Tomato Variety Trial Field Day and BBQ, LeGrand PDF 6/27/11
January 2005 Processing Tomato Production Meeting Agenda PDF 6/27/11
August 2004-Field Day Fresh Market Tomato Bariety Trial Field Day PDF 6/27/11
August 2004 Midseason Processing Tomato Field Day PDF 6/27/11