Delta Region Areawide Aquatic Weed Project

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2026 Rice Production Workshop Scheduled in Richvale

March 2, 2026
Contact: UCCE Sutter–Yuba142A Garden HighwayYuba City, CA 95991Phone: (530) 822-7515Email: wbrimdeforest@ucanr.edu RICHVALE, CA — Rice growers and agricultural professionals from across the Sacramento Valley are invited to attend the 2026 Rice Production Workshop, a two-day educational program…
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Seed Production Update

March 2, 2026
Author: Timothy Blank, Director of Seed Certification Operations, California Crop Improvement Association (CCIA)~28,500 acres were inspected by the California Crop Improvement Association in 2025, of which 25,783 acres were eligible for seed production. Of the eligible acres harvested for seed, 1117 were…
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2025 Delta Rice Recap

February 23, 2026
By Michelle M Leinfelder-Miles
This article is my annual review of UCCE Delta rice research and seasonal observations.Variety Trial: Delta rice acreage has been steadily increasing, and yields are comparable with the statewide average (Table 1). I estimate that Delta acreage approached, if not exceeded, 15,000 acres in 2025. To…
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Weedy Rice Survey Update

February 16, 2026
By Troy L Clark, Luis A Espino, Whitney B Brim-Deforest
We have conducted field surveys of weedy rice in 2020 and 2025. The objectives were to document the location of weedy rice infestations, determine how severe these infestations are, and evaluate the spread of this weed. In 2020, we inspected 15,748 acres of rice. Of these, 3,412 acres (21% of surveyed…
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Save the Date!

February 12, 2026
2026 Propanil Stewardship Meeting"Propanil Stewardship & Alternative Watergrass Management Strategies"Dates: February 26 (Thursday), 2026 Time: 10:00 am - 12:00 pmLocation: CIP Conference Room, 100 Sunrise Blvd., Colusa, CA<Agenda>
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hedgerow site 2025 demonstration

Fall Update: Rice Field Research Projects in the Sacramento Valley

February 9, 2026
By Whitney B Brim-Deforest, Sarah Marsh Janish, Luis A Espino
It has been a busy year! Here is a quick recap of some of our studies.Hedgerows: This study, initiated in 2024, is evaluating how planting rows of native species along permanent levees can influence beneficial insect activity in rice fields as well as weed pressure on levees in rice systems. Preliminary data…
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WarAgainstWeeds podcast

Broomrape podcast interview

February 4, 2026
By Brad Hanson
Some of my weed science extension colleagues in the midwest have a podcast called War Against Weeds  supported with funding from the North Central IPM Center.  I was interviewed on the podcast a few years ago about herbicide resistant weeds in orchards.  Earlier this week, they invited me back…
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American pondweed with emerged inflorescences. Submerged or floating-leaved aquatic plants with roots within the soil sediment.
UC Weed Science (weed control, management, ecology, and minutia): Article

UCCE Sutter-Yuba Advisors to Participate in Weed Management Area Project

January 30, 2026
By Whitney B Brim-Deforest, Troy L Clark
UCCE Sutter–Yuba is pleased to announce the launch of a new collaborative project with the Sutter and Yuba County Agricultural Commissioners’ Offices focused on the identification and management of invasive weed species in the region. As part of this effort, this project will be coordinating ongoing mapping…
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Upcoming Winter Grower Meetings

January 12, 2026
2026 Rice Winter Grower Meetings CE Credits: 2 DPR (0.5 L&R, 0.5 Aerial, 1 Other) & CCA Pending Wednesday, Jan 21Richvale: 8:00 AM @ Evangelical Church (5219 Church St)Willows: 1:00 PM @ Willows Memorial Hall (525 W Sycamore St)Thursday, Jan 22Colusa: 8:00 AM @ CIP Conference…
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Save the Date!

October 29, 2025
IPM Rice Workgroup Meeting: Drip Irrigated Rice and Tomato RotationsAll are welcome! We are soliciting feedback, experiences, and opinions about rotating rice with tomatoes, with a focus on drip-irrigating rice. Lunch will be included. Please Click Here for the Registration Form! Date:…
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Fig. 6. Adoption of herbicide spot application (A) and herbicide spray line outside the mulch line/tree rows (B) in a conventional walnut orchard site where walnut leaf mulch was implemented for weed management.

Response of Walnut Leaf Mulch for Weed Management

September 22, 2025
By Clebson G Goncalves
     The use of walnut leaf biomass as a natural mulch and an eco-friendly practice can help prevent weed seed germination by excluding light and/or acting as a physical barrier that prevents weed emergence. Beyond that, several studies have shown potential allelopathic effects of juglone and…
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Brad Hanson lecturing at Weed Science School 2023
UC Weed Science (weed control, management, ecology, and minutia): Article

Weed Science School 2025

September 4, 2025
 Weed Science School is less than two weeks away! Join the UC Davis Weed Research and Information Center for this 2.5 day course. Learn through lectures and laboratory demonstrations at the Bowley Plant Science Teaching Facility at 1200 Extension Center Drive in Davis, CA on September 16-18, 2025.Weed…
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Weedy rice plant

Weedy Rice Survey in Progress

September 2, 2025
UCCE is currently conducting a survey of fields known to have weedy rice. The objective is to determine if the infestations have increased in the past five years, since the last survey was conducted. We are contacting growers that we know have the weed to let them know about the survey. But if you suspect…
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DPR’s New 2025 License Renewal and CE Verification Process

August 29, 2025
By Chris J McDonald
It’s that time of the year to start preparing for license and certificate renewal season for pesticide applicators with the California Department of Pesticide Regulation (DPR). Applicators should have received their renewal notice in the mail (and if not, then please contact DPR at LicenseMail@cdpr.ca.gov)…
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A warm week ahead. Do we need to be worried about chalkiness?

August 29, 2025
By Bruce A Linquist
Short answer: Not like we did in 2022. However, in the northern part of Sacramento Valley, temperatures are forecasted to be warm and chalkiness may be an issue for a sensitive variety like M-211. You can read on for more. Grain chalkiness occurs when there are high temperatures (especially at night)…
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Blast

Blast in the Valley

August 28, 2025
Yesterday (Aug 28) at the Rice Experiment Station Field Day tour I mentioned that I had not seen any blast this year (only in one location where a little patch of M-105 was planted late on purpose to see if blast would develop).Well, today I found neck blast in a commercial field in Glenn County and got a…
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Drill seeding: How deep is too deep?

August 20, 2025
By Alex Ceseski
How deep is too deep to drill rice in California? I’ll get the obvious answer out of the way first: it depends! If you’re thinking of trying out drill seeding in the future, there’s going to be a learning curve. Much like with water-seeded rice, your variety selection matters as much as the weather,…
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Welcome

Participants
NASA Ames Research Center
USDA-ARS Invasive Species and Pollinator Health Research Unit 
California Dept of Parks & Recreation - Division of Boating & Waterways
California Dept of Food & Agriculture
Sacramento-San Joaquin Delta Conservancy
University of California, Davis
Local mosquito vector control districts
 
General areas of study
Weed mapping tools
Management techniques and strategies
Weed effects on ecosystems, native plants, and water quality
Biological control agents
Effects of weeds on mosquito populations
Bio-economic modeling of weed control costs and project benefits

 

Announcements

As of September 2021, a special issue of the Journal of Aquatic Plant Management features participants in DRAAWP. Individual papers can be seen under the "Journal Articles" tab to the left.

We have posted a new 2020 Areawide Report under the Products tab to the left.

This year's Aquatic Plant Management Society annual meeting is planned for July 12-14, 2021, in New Orleans.

The Western Aquatic Plant Management Society (WAPMS) recently participated in a virtual conference jointly with the Western Society of Weed Science. The 40th annual meeting of WAPMS is scheduled for March 7-11, 2022. 

Our DRAAWP informational brochure is available from the Site Navigation tab at the left.

 

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