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Rice Briefs

Rice production information for Colusa and Yolo Counties.

Issue Articles Type Date Added
Upcoming Event - Rice Quality Workshop -registration required-

The California Rice Commission, UC Davis and the UC Cooperative Extension are hosting the 2024 Rice Quality Workshop on July 18th from 9:00 AM to 12:30PM. The event will be held at Granzella’s Banquet Hall located at 457 7th St., Williams, CA.

The registration fee is $50/person and includes all instruction, a copy of the Rice Quality Handbook, coffee and lunch. Registration is limited to the first 100 participants. Industry experts will speak on various topics relating to key aspects of California rice quality. the meeting agenda is attached to this announcement.

Click here to register for this event.


Click here to visit the UCCE Colusa website

PDF 6/21/24
Colusa/Yolo Rice Briefs - June 2024


  • Upcoming Events
  • Pendimethalin Use in CA: Clarifications
  • No-Till Drilled Rice – 2nd Year Updates
  • Tadpole Shrimp Issues in 2024
  • Late Season Control Options for Watergrass
  • Cover Crop Variety Trial
  • Be Wary of ChatGPT for Ag Questions
DOCX 6/3/24
May 2024 - Seeking Tadpole Shrimp Collaborators

UCANR is looking for fields where we can sample tadpole shrimp to test for pyrethroid resistance/susceptibility. We will be gathering soil/shrimp and then using these samples to run laboratory bioassays and measure susceptibility if we get enough shrimp.

What is needed are fields with a history of shrimp pressure. We just need to be pointed to fields that we can collect from and then get either map pin(s) to go to (or directions) or a ranch map that is marked with shrimpy locations or that is paired with specific fields to visit. Feel free to reach out to Sarah Marsh (530-203-8585) and contact Ian Grettenberger directly at imgrettenberger@ucdavis.edu or 360-790-0035.

JPG 5/6/24
Colusa/Yolo Rice Briefs - April 2024
  • Upcoming Events
  • New Herbicides Bring Additional Tools to CA in Rice Weed Management
  • An Evaluation of Pyraclonil in CA rice
  • Don’t Forget About the Bugs!
  • Imagine… Thoughts on No-Till Rice


PDF 4/8/24
2024 Cover Crops in Rice - Field Demonstration Day

Cover Crops in Rice - Field Demonstration Day
Thursday, February 29, 2024
10:00am – 12:00pm
Staten Island, 23319 N. Staten Island Road, Thornton

9:30am Arrive at Staten Island grain silo

9:45am Depart to field location – Don’t be late!

10:00am Welcome and Introductions

10:05am Winter Cover Cropping in Rice Systems– Field Demonstrations

10:20am Cover Crop Variety Evaluations

10:35am A Grower’s Perspective on Cover Crops

10:55am Healthy Soils Program – Block Grant Pilot Program

11:10am What’s New in Rice Weed Management

11:25am Weedy Rice Updates

11:40am Discussion, Viewing of Field Plots, Evaluation

CCA continuing education credits have been approved (0.5 PM, 1.0 CM, 0.5 PD). Refreshments will be provided. We thank our project sponsors and partners for supporting this work, and we thank you for your participation!

PDF 2/9/24
Colusa/Yolo Rice Briefs - January 2024
  • 2023 UC Rice Variety Trial Results
  • Choosing Medium Grain Varieties
  • New Rice Herbicide: Cliffhanger
  • New Rice Weed: White Water Fire
  • Rice Seed Midge Insecticide Trials
  • Evaluating Losses from Stem Rot
  • New Rice Farming Systems Advisor for Colusa and Yolo Counties
  • Survey: Challenges and Opportunities for Organic Rice
PDF 1/22/24
2024 Rice Grower Meetings

2024 Rice Grower Meetings

Richvale:  Tuesday, January 9, 8:00 am, Evangelical Church, 5219 Church St., Richvale

Willows:   Tuesday, January 9, 1:00pm, Glenn County Office of Education, 311 South Villa Avenue, Willows

Colusa:     Wednesday, January 10, 8:00 am, CIP Conference Room, 100 Sunrise Blvd., Colusa

Yuba City:  Wednesday, January 10, 1:00 pm, Veterans Hall, 1425 Veterans Memorial Circle, Yuba City

Woodland:  Thursday, January 11, 8:00 am, Norton Hall, 70 Cottonwood St, Woodland

TIME:  Doors open at 8:00 am and meetings start at 8:30 am at Woodland, Richvale, and Colusa.

Doors open at 1:00 pm and meeting starts at 1:30 pm at Glenn and Yuba City.


For full agenda please download file.

PDF 12/6/23
Rice Briefs - November 2022
  • Rice Crop Rotation Tool
  • Looking back at 2022
  • High Night time Temperatures Partially to Blame for Increased Chalk and Decreased Milling
  • New smart insect pest detection technology for agricultural and food products
  • 2022 Pest Review
  • 2022 Delta Rice Recap
PDF 11/17/22
2022 Annual Rice Grower Meetings

2022 Annual Rice Grower Meetings

Please see attached for details.

PDF 1/6/22
2021 Rice Growers Meeting - Virtual format

2021 Rice Growers Meeting

February 11, 2021

9am - 12pm

Virtual via Zoom

$10 fee


Continuing Education Units applied for from CA Department of Pesticide Regualtion (DPR) and Certified Crop Advisers (CCA).

Contact anrprogramsupport@ucanr.edu, or call (530) 750-1361 for more information.

PDF 1/11/21
Sacramento Valley Pest Management - Virtual Webinar

UCCE Virtual Webinar

Sacramento Valley Pest Management

Wednesday, December 9th - 9:00 a.m. - 12:00 p.m.

9:00 am - Weeds in Rice Research Update - Whitney Brim-DeForest, UCCE Rice & Wild Rice Advisor

9:30 am - Rice Pest Management Update - Luis Espino, UCCE Rice Farming Systems Advisor

10:15 am - Integrated Pest Management of Processing Tomatoes - Amber Vinchesi-Vahl, UCCE Vegetable Crops Advisor

10:45 am - Field Crop Pest Management Update - Sarah Light, UCCE Agronomy Advisor

11:30 am - Regulatory Update - Scott Bowden, Dep. Ag Commissioner, Sutter County

Registration Fee $25  

Link and instructions to join Zoom will be emailed to registrants

DPR and CCA Continuing Education Credits Pending: 2.0 hours "Other", 0.5 hours Laws & Regs

Registration Here: http://ucanr.edu/survey/survey.cfm?surveynumber=32431

Logistics: Rene McCrory, rjmccrory@ucanr.edu, 530-822-7515
Course Content: Sarah Light, selight@ucanr.edu, 530-822-7515

PDF 11/16/20
Unsolicited Seed Shipments from China

Commissioner Greg Hinton Phone: 530-458-0580
100 Sunrise Blvd. Suite F Fax: 530-458-5000
Colusa, CA 95932 Email: ccag@countyofcolusa.com

July 30, 2020

Contact: Colusa County Agricultural Commissioner’s Office

Mysterious and Unsolicited Seed Shipments Arriving in Colusa County
The California Department of Agriculture (CDFA) has become aware of a number of reports regarding “mysterious and unsolicited seed shipments from China.” These shipments have been arriving at homeowner and business locations throughout the country, including here in Colusa County. The package contents typically list the contents as jewelry, toys, or a number code.

The CDFA is currently in communication with the United States Department of Agriculture (USDA) to determine what the actions will be for these seed packages. In the meantime, CDFA is instructing residents not to open any unsolicited seed packets received. In addition, please DO NOT PLANT or dispose of the seeds. Instead, please immediately contact the Colusa County Agricultural Commissioner’s Office if you come into possession of these unsolicited seeds, and we will arrange to pick up the seeds or you may drop them off at our office.
Seeds that are legally sold to residents of California must go through proper channels in order to protect California’s multi-billion dollar agricultural industry. Colusa County is one of California’s significant seed producing locations. Seeds with unknown origin and those that have not been properly inspected, treated, or tested may have a significant impact on our local industry and ag based economy.

If you have received these seeds, please contact our office via the options below to arrange for delivery or pick up. If you have planted any seed

PDF 7/30/20
CANCELLED - Training for field workers in Spanish 3-24-20

The meeting "Training for field workers in Spanish" scheduled for March 24 has being cancelled in order to comply with the guidelines released by the California Department of Public Health. We are working on rescheduling the event and will communicate the new date promptly. 

If you have any questions, please call me, 530-635-6234.


Luis Espino

Rice Farm Advisor, UCCE Butte and Glenn Counties

PDF 3/13/20
Soil, Water, and Pest Mgmt Training for Field works in Spanish

Meeting Announcement: Training for Field Workers in Spanish 

"Soil, Water, and Pest Management Training for Field Workers in Spanish"

Tuesday, March 24th, 2020, 8:00 - 11:30

142A Garden Highway, Yuba City

This training is for field managers and operators working on field crops such as rice, wheat, alfalfa, beans, sunflower, etc. Tree crops managers and operators are welcomed as well, but the emphasis will be in field crops.

The training aims to give field workers without formal education a basic understanding of plant physiology, soil management, water use, and pest management, so they understand field operations better and become more engaged in the farming operations.

The training will be conducted in Spanish. For questions, contact Luis Espino, 530-635-6234 or Sarah Light, 530-822-7515.

PDF 3/2/20
Meeting Announcement - 2020 Rice Grower Meetings

2020 Annual Rice Grower Meetings

Sponsored by UC Cooperative Extension

-------------- 5 Locations --------------


Richvale: Monday, Jan. 13, 8:30am, Evangelical Church, 5219 Church St., Richvale

Willows: Monday, Jan. 13, 1:30pm, Glenn County Office of Education, 311 South Villa Avenue, Willows

Colusa: Tuesday, Jan. 14, 8:30 am, Colusa Casino Resort, 3770 Hwy 45, Colusa

Yuba City: Tuesday, Jan. 14, 1:30 pm, Veterans Hall, 1425 Veterans Memorial Circle, Yuba City

Woodland: Wednesday, Jan. 15, 1:30 pm, Norton Hall, 70 Cottonwood St, Woodland

 TIME: Doors open at 8:00 am and meetings start at 8:30 am at Richvale and Colusa.Doors open at 1:00 pm and meetings start at 1:30 pm at Glenn, Yuba City and Woodland.


8:00 am (1:00 pm) Doors open, sign-in, coffee 

8:30 am (1:30 pm) Call meeting to order

Rice Research Board Nominations – Dana Dickey, Rice Research Board

8:35 am (1:35 pm) California Rice Commission Referendum – Tim Johnson, California Rice Commission

8:50 am (1:50 pm) Drinking Water Well Requirement – Roberta Firoved, California Rice Commission

9:00 am (2:00 pm) Rice Pesticide and Regulatory Update – County Ag Commissioner

9:15 am (2:15 pm) Variety Update – Kent McKenzie, Rice Experiment Station

9:30 am (2:30 pm) Weedy Rice – Whitney Brim-DeForest, UCCE

9:45 am (2:45 pm) Disease Management – Luis Espino, UCCE

10:00 am (3:00 pm) Arthropod Management – Ian Grettenberger, UCCE

10:15 am (3:15 pm

PDF 12/9/19
August 2018

Don't forget the rice field day! - Management of stem rot - New watergrass species - Testing for suspected herbicide resistance - Rice Yield Contest

PDF 8/22/18
June 2018

Rice Production Workshop - Planting recap for 2018 - Weed control in rice: matching herbicides with weeds of your field - A weed problem all rice growers should be aware of: weedy rice.

PDF 6/25/18
April 2018

Fertility Management Tips - Look Out for New Weed Species - Early Season Arthropod Management Update - Armyworms 2018: Get Ready - 2018 Yield Contest

PDF 4/6/18
November 2017

2017 Rice Recap -  Delta Rice Recap - End of Year Weedy Rice Update - Armyworms Again

PDF 11/14/17
August 2017

Herbicide Resistance in Rice - Rice Disease Update - Time for Weedy Rice Scouting - Rice Yield Contest - Don't Forget the Rice Field Day!

PDF 8/7/17
June 2017

Nitrogen and Water Management - How to Select Follow-up Herbicides - Armyworms Revisited - Cass Mutters Retires - 2017 Yield Contest

PDF 6/6/17
May 2017

Managing rice in a late planted year

PDF 4/24/17
March 2017

Summary of 2016 University of California Rice Variety Trials - Biological Characteristics of Weedy Rice Compared to Cultivated Rice - Workshop Announcement: Insect Pest Management in Rice Mills and Rice Storage Facilities.

PDF 3/15/17
September 2016

Red Alert! - Best Management Practices for Weedy Red Rice - 2016 Armyworm Wrap Up

PDF 9/28/16
July 2016

Don't forget the rice field day! - 2016 Rice Yield Contest - Rice Weed Course - Armyworm Update - Emerging Weed Issues - Meet our New Rice Advisor in Sutter, Yuba, Placer and Sacramento Counties

PDF 7/18/16
May 2016

Weedy Red Rice - Best Management Practices for Weedy Red Rice - Winged Water-Primrose Update

PDF 5/17/16
March 2016

Summary of 2015 University of California rice variety trials - When is the optimal time to plant rice in the Sacramento Valley? - Preparing for armyworms.

PDF 3/22/16
August 2015

Collecting weed seeds for herbicide-resistance testing - Armyworm outbreak: what's next? - Salinity management in rice - Rice Production Workshop presentations available on-line - Resistant Weed Testing Form 

PDF 8/3/15
June 2015

Meeting Announcement: Rice Production Workshop - New UC Rice On-line - Midseason Nitrogen - Diseases and Cultural Practices - Bird Habitat Program Continues and Expands

PDF 6/22/15
April 2015

Tadpole shrimp research update; Arthropod management update

PDF 4/30/15
February 2015

Summary of 2014 University of California Statewide Rice Variety Trials, Managing rice with limited water

PDF 2/28/15
August 2014

Water Management to Mitigate Blanking, Rice Yields Components, Rice Strawlage, Planning Harvest and Rice Field Day announcement.

PDF 7/31/14
June 2014

Management of Propanil Resistant Sedges - Midseason Nitrogen Fertilizers - Bird Habitat Continues and Expands - Factors Related to Rice Blast Incidence and Severity - Chris Greer Appointed Vice Provost for University of California Division of Agriculture & Natural Resources

PDF 1/1/15
April 2014

Managing rice with limited water - Flooding time and seedling pests - Stay up-to-date with the UC Rice Blog

PDF 5/1/14
February 2014

Summary of 2013 University of California Statewide Rice Variety Trials

PDF 2/6/14
April 2013

Summary of 2012 University of California Statewide Rice Variety Trials

PDF 4/16/13
July 2012

Propanil-resistant smallflower umbrellasedge - Armyworms - Rice Experiment Station Field Day announcement

PDF 7/30/12
June 2012

Behavior of winged primrose willow and herbicide options for control - Rice tillering.

PDF 6/21/12
May 2012

Potassium fertility in rice - Managing late planted rice

PDF 5/10/12
March 2012

Summary of 2011 University of California Statewide Rice Variety Trials

PDF 3/21/12
September 2011

Weed alert: new weed identified in California rice.

PDF 9/20/11
August 2011

Rice blast: more of the same with a bit of a twist in 2011 - Armyworms - 2011: About the same as last year.

PDF 8/16/11
June 2011

Salinity in rice fields - Difficult start for 2011.

PDF 6/29/11
May 2011

Early pests of rice: tadpole shrimp and rice seed midge

PDF 5/26/11
April 2011
2010 rice variety trials results - How much phosphorus should you apply? - New UC Rice Blog - Rice Winter Meetings and Rice Production Workshop presentations available on-line - Contributions of California rice farmers to the economy - New UC ANR publications.
PDF 4/1/11
September 2010 What a year for rice blast - How long does it take for rice to ripen? - Measuring grain moisture content before harvest - Insects of farm stored rice - Using a desiccant to accelerate dry down. PDF 9/24/10
June 2010 Temperature and plant growth, midseason nitrogen fertilizer, managing weed populations to protect against herbicide resistance. PDF 6/24/10
April 2010 Pre-plant nitrogen starter application, nitrogen and early drains, managing late planted rice, early season rice diseases. PDF 4/27/10
March 2010 2009 rice variety trial results, red rice update, rice water weevil distribution in California rice fields. PDF 3/8/10
July 2009 Panicle initiation and differentiation, herbicide programs for resistant late watergrass, managing nitrogen fertilization for early season drains PDF 7/31/09
May 2009 Monitoring early pests, herbicide programs for resistant late watergrass, measuring salinity of irrigation water PDF 5/19/09
April 2009 2008 rice statistics 2008 rice variety trials results Red rice survey What is the real cause of high rice prices? PDF 4/8/09
August 2008 Rice Experiment Station Field Day, panicle blanking, blast, fighting mosquitoes in Colusa County. PDF 8/4/08
July 2008 Top-dressing, rice leafminer, armyworms PDF 10/29/09
April 2008 Phosphate and Rice-Field Algae Understanding Nitrogen Losses Due to Early Field Drainage Straw Incorporation and Nitrogen Management PDF 9/30/10
March 2008 2007 variety trials results for Colusa, Glenn and Yolo Counties. PDF 3/20/09
February 2008 Rice straw meeting announcement, alternative stand establishment methods management tips, rice establishment systems in 2007 PDF 1/31/08
January 2008 2008 Winter meetings locations and agenda. Announcement of the Rice Technical Working Group meeting in San Diego, Feb. 18-21 2008 PDF 11/26/08
August 2007 Announcing our new Rice Advisor Resistant Watergrass Control Field Meeting - September 5, 2007 PDF 8/12/08