Delta Region Areawide Aquatic Weed Project

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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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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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A lot of April rain!

May 1, 2026
By Bruce A Linquist
We have had a lot of rain this past April. I wanted to look at this year relative to previous years. I maintain an on-going database from three CIMIS stations in the Sacramento Valley Rice growing region (Davis, Colusa/Williams and Durham/Biggs). I develop an index where I take the average values from these…
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Remembering Jodie Holt

April 29, 2026
By Justin M Valliere
It is with great sadness that we share the passing of Dr. Jodie Holt, a longtime faculty member in the Department of Botany and Plant Sciences at UC Riverside, who passed away April 27, 2026. Jodie was a leader in weed science whose work helped shape the field at the intersection of ecology and…
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nutria where you can observe its long, rat-like tail

Update on Nutria Populations

April 20, 2026
By Sarah Marsh Janish
Last year during the 2025 Winter Grower Meetings, we mentioned nutria as an emerging invasive pest capable of harming rice fields, especially in the Delta region. After these meetings, we received several anecdotal confirmations of sightings of nutria and nutria burrows around the Stockton area and further…
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Stem Rot Monitoring Guidelines for the Mid Boot Stage

April 13, 2026
By Luis A Espino
Stem rot is a common rice pathogen present in all fields. The pathogen produces resting structures called sclerotia that survive in the soil after harvest. The sclerotia germinate in the spring and the pathogen infects tillers at the water level approximately when plants reach panicle initiation (45 to 50…
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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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