Delta Region Areawide Aquatic Weed Project

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To topdress or not to topdress?

May 30, 2025
By Luis A Espino
Given the current economics of rice, you may be planning on not topdressing. If there is enough N up front as aqua, this should be fine. The question is how to determine if you have enough. One easy, practical way to confirm that you do not need a topdress is to set up a small overfertilized area. To do this…
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2025 No-Till Rice Field Day - Save the Date!

May 12, 2025
No-Till Rice Field Day  An in-depth discussion that explores no-till drill-seeded rice planting and management strategies June 10, 2025 9:00 am – 11:00 am694 Watson Road, Biggs, CA 95917Please click here for the agenda: Agenda Program8:30 am    Registration  9:00…
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QR code for survey
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Survey on Weed Control Technologies for Tree and Vine Crops

May 6, 2025
By Brad Hanson
Note: I'm sharing a survey request related to grower and industry needs related to novel weed control technologies in orchards, vineyards, and other perennial specialty crops.  Our team of research collaborators is developing this information as a first step towards a future coordinated national…
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The best soil P test for rice: Olsen-P vs Bray-P

April 18, 2025
By Bruce A Linquist
This year, with high input costs and low rice prices, a lot of growers are testing their soil to determine if they need to apply P and K fertilizer.  I have received a number of calls this week asking about interpreting their soil P test for rice soils. I have recommended using the Olsen-P test (or a…
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Four men in weedy area. One is holding a measuring container while another sprays liquid into it from a wand attached to a backpack sprayer. A third person holds a clipboard and the furth holds a stopwatch.
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New Online Course: Calibrating Herbicide Applications for Non-Agricultural Areas

April 14, 2025
By Cheryl A Reynolds
Calibration might sound intimidating, but it’s critical for safe and effective herbicide application. Proper calibration ensures that the correct amount of pesticide is applied to an area while achieving the desired level of pest control. To support land managers and pesticide applicators, the UC Statewide…
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Late Rains, Small Plants, Fast Phenology

April 4, 2025
By Chris J McDonald
Originally Posted April 1, 2025. This year in Southern California the rainy season got off to a late start. Southern California has received about one half of the average precipitation total as of this writing (and that's not an April fool's joke). Last year we had over 50% more rainfall than the…
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webinar video on electric weed control in organic perennial crops

April 2, 2025
By Brad Hanson
A quick repost to share a link to a recent January 14, 2025 webinar on Electric Weed Control in Organic Perennial Crops. The webinar was part of a multi-state research and extension project that includes researchers from Oregon State University, Cornell University, and UC Davis and outreach support from…
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WeedCut: BMPs for herbicide application techniques

April 2, 2025
By Brad Hanson
Sharing a recent post from the California Invasive Plant Council (Cal-IPC) about a new page on the WeedCUT online decision support tool. -Brad--------------------------------------------------------------------New WeedCUT Feature: BMPs for Herbicide Application Techniques   Confused about…
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field map of the hedgerow and control plot area
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Hedgerows in Rice Update

February 26, 2025
By Whitney B Brim-Deforest, Taiyu Guan, Luis A Espino, Sarah E Light, Consuelo B Baez Vega
Incorporating hedgerows in rice could provide growers with an alternative method for managing field margins without relying on pesticide applications to control the pests along the edges of rice fields.
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Propanil Stewardship Meeting - Save the Date!

February 10, 2025
By Taiyu Guan
** Agenda will be shared shortly** Date: March 17th; Location: 69 W Kentucky Ave, Woodland, CA 95695 - Yolo County Farm Bureau Date: March 18th; Location: Evangelical Church, 5219 Church St.
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Best Practices for Using Glufosinate in Hops

January 16, 2025
By Brad Hanson
Reposted from the "Weeders of the West" blog with author's permission. Marcelo Moretti summary of research on glufosinate best practices in hops (direct link to article). -Brad Posted by jenna.osiensky | January 9, 2025 Marcelo L.
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Stinknet spreads because it’s a difficult weed

January 15, 2025
By Chris J McDonald
Stinknet (Oncosiphon pilulifer) is an annual weed spreading aggressively in the southwestern US. This species was first found in North America the early 1980's in Southern California and it continues to spread aggressively in California and Arizona and a few populations have been found in Nevada.
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Thoughts on Rice: Podcast

January 15, 2025
By Sarah Marsh Janish
The University of California Cooperative Extension (UCCE) has launched Thoughts on Rice, a new podcast from the UCCE rice advisors, available on all audio streaming services. This podcast is for growers, PCAs, consultants, and other industry professionals in the rice industry.
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WeedCUT (Weed Control User Tool) expands!

January 8, 2025
By Thomas J Getts
Back in 2021 the California Invasive Plant Council (CAL IPC) and UC IPM launched the online decision support tool WeedCUT for wildland weed mangers to help assist making management decisions for wildland weeds.
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Weed Updates 2024

January 8, 2025
By Whitney B Brim-Deforest, Taiyu Guan
General review of the year: Walter's barnyardgrass AKA coast cockspur (Echinochloa walteri) continues to spread across the valley.
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2024 Delta Rice Recap

December 25, 2024
By Taiyu Guan
Delta rice acreage has been steadily increasing, and yields are comparable with the statewide average. I estimate that acreage approached, if not exceeded, 15,000 acres in 2024. This article is my seasonal update on UCCE Delta rice research and observations.
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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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