Delta Region Areawide Aquatic Weed Project

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White Water Fire

August 25, 2026
By Sarah Marsh Janish, Whitney B Brim-Deforest
 Bergia capensis (white water fire); Botanical illustration. Plants of the coast of Coromandel, vol. 2. 1798.IntroductionIn 2023, a new annual broadleaf weed, White water fire (Bergia capensis L.), was reported in a Butte County rice field. This ID marked the first confirmed report of this pest in…
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2026 Kearney Field Crops, Alfalfa and Forage Field Day

August 24, 2026
By Jorge A Angeles
Join us on Thursday, September 10, 2026, from 7:00 AM – 12:40 PM at the Kearney Agricultural Research and Extension Center.No cost to attend! All are welcome.Where:  9240 South Riverbend Avenue, Parlier, CA 93648.What:  Research plot tours and discussions with UC researchers about research updates,…
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Save the Date! (Rice Field Day 2026)

August 4, 2026
By Taiyu Guan
The annual Rice Field Day will be Wednesday, August 26th, 2026, at the Rice Experiment Station (RES), Biggs, California. We cordially invite you and your associates to join us for this event. The purpose of the Rice Field Day is to give rice growers and others an opportunity to observe and discuss research…
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Blast in 2026

August 2, 2026
By Luis A Espino
I found blast in two fields last week; one is near Willows and the other is near Maxwell. The infections seem to be starting; there were only a few leaf lesions. In these fields, and in a third one near Knights Landing, I am also monitoring weather.Three things are needed for disease to start: the pathogen,…
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2026 UC Dry Bean Field Day

July 27, 2026
By Michelle M Leinfelder-Miles
UC Davis and UC Cooperative Extension will host the UC Dry Bean Field Day on Thursday, August 13, 2026 from 9:30am to 12:00pm. The field day will begin along Bee Biology Road on the UC Davis campus where attendees will have the opportunity to view research plots. UCCE sandwich board signs will be set up…
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California Crop Improvement Association update

July 15, 2026
By Taiyu Guan
Author: Katy SodenThe California Crop Improvement Association (CCIA) has experienced several exciting changes in recent months as we continue to strengthen our commitment to serving California seed producers. CCIA recently welcomed two new members to our field services team. Emily Richter joined the…
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UCCE Rice Weeds Program: Submit seeds for herbicide resistance testing

July 15, 2026
By Whitney B Brim-Deforest
It's weed seed collection season! As weeds mature through summer and early fall, now's the time to gather seed samples from any herbicide-resistant species you've spotted in your fields.How to know if what you are seeing is likely resistance (and what to collect): Weeds are located in clumps“Streaks” of…
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Is the bleach treatment against bakanae still working?

July 15, 2026
By Luis A Espino
In the past few years, the number of calls that the rice advisors have been getting about bakanae have increased substantially. In almost all cases, the grower or PCA reached out to us because there was high incidence of bakanae in the field even though the seed had been treated with bleach. This led to some…
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2026 rice acreage and supply comments

July 15, 2026
By Sarah Marsh Janish
According to the June 2026 NASS Acreage Report, U.S. rice planted area fell sharply to 2.017 million acres, a 28% drop from the previous season and the lowest number of rice acres since the 1970s. The steep decline is largely attributed to severe weather issues (including localized moderate to extreme…
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Delta armyworm monitoring

July 15, 2026
By Taiyu Guan
Author: Michelle Leinfelder-MilesSeasonal monitoring for armyworms began in late-May in the Delta region. Our monitoring involves scouting for damage and deployment of pheromone bucket traps that catch the true armyworm moths. Traps are set up at three Delta locations, where at each location, there are three…
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Cultivating resilience: mental health resources for the ag community

June 8, 2026
By Sarah Marsh Janish
The demands of agriculture are unique, often blending long hours, unpredictable weather, and financial pressure. Taking care of your mental well-being is just as vital as tending to your crops. Whether you are looking for proactive stress management or need immediate support, there are resources specifically…
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Effects of azoxystrobin when disease pressure is low

June 1, 2026
By Luis A Espino
Azoxsytrobin (Quadris, Tetraban) is the most used fungicide on rice in California. Azoxystrobin has been in use since the late 1990s. This fungicide was registered after rice blast was discovered in California in 1996. More recently, several years of trials showed that when azoxystrobin is used at the late…
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Ongoing diesel exhaust fluid (DEF) action

May 25, 2026
By Sarah Marsh Janish
Background Since 2010, most on-road and many off-road vehicles and equipment have used selective catalytic reduction (SCR) systems to inject diesel exhaust fluid (DEF) into exhaust streams with the intended goal of nitrous oxide (NOx) emission reduction. In cases where DEF levels ran low or unexpected…
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Best practices for early-season weed control in California rice

May 18, 2026
By Whitney B Brim-Deforest
Reprint from Rice Farming, March 2026Early season weed control is vital to keeping yield potential high in California rice. Most of our yield potential is lost to weed competition in the first 30 days. The vast majority of that yield loss is due to watergrass species (Echinochloa spp.) including…
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Where can you reduce fertilizer input costs?

May 11, 2026
By Bruce A Linquist
This post is somewhat a repeat of last year’s. However, while last year the rice price was low, this year we have both low rice prices and high fertilizer costs. Therefore, there is even more reason to carefully manage your fertilizer input costs. Below are some suggestions on how you can reduce your costs…
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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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