- Author: Sarah Lorraine Marsh
- Posted by: Gale Perez
My name is Sarah Marsh, and I am excited to join UC Cooperative Extension as the new Rice Farming Systems Advisor serving Colusa and Yolo counties. I will be based out of Colusa at the Colusa UCCE office. I grew up on a diversified row-crop and orchard farm in Arbuckle and am grateful for the opportunity to serve the community in which I was raised. After completing my undergraduate degree in Plant and Environmental Soil Science at Texas A&M University, I obtained a M.S. in Horticulture and Agronomy at UC Davis, where I worked with Dr. Kassim Al-Khatib in studying weeds and herbicide resistance in rice agroecosystems. I have since worked in rice...
- Author: Aaron Becerra-Alvarez
- Author: Sarah Lorraine Marsh
- Author: Kassim Al-Khatib
- Posted by: Gale Perez
A new herbicide for early-season weed control in water-seeded rice will be available soon. The herbicide active ingredient (a.i.) is pyraclonil, which will be trademarked as Zembu™ (1.8% a.i.) by Nichino, America Inc. The mode of action is a protox porphyrinogen (PPO)-inhibitor or Group 14. This herbicide is formulated as a granule and will be used as a residual preemergence for application on the day of seeding onto flooded fields. The use rate is 14.9 lbs ac-1 applied by air. While this herbicide is not a new mode of action for water-seeded rice, it is a new mode of action for early-season residual weed control. Pyraclonil is widely used for weed control in paddy fields worldwide and is the most commonly utilized...
- Author: Whitney B Brim-Deforest
- Editor: Taiyu Guan
- Editor: Consuelo Baez Vega
- Posted by: Gale Perez
From the UC Rice Blog :: August 23, 2023
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Pest Control Advisers (PCAs) and growers were very creative and timely in planning and applying products this year, and control was good in many fields. The two most widespread weed control problems that I noticed this year were the watergrass complex and sprangletop. We have widespread resistance, but control issues this year were likely also related to the wet spring, as well as colder temperatures which resulted in different emergence timings and weed growth patterns as compared...
- Author: Whitney Brim-DeForest
- Editor: Consuelo Baez Vega
- Editor: Taiyu Guan
- Author: Gale Perez
Coming out of 2022, where roughly half of all California rice fields were left fallowed last year, and others may have been fallowed for two seasons, many of us have questions about what weed management will look like in 2023. While we do not have data on what a 1- or 2-year fallow does to all of our major weed species, we have some preliminary and anecdotal data that might lend some insight.
For small-seeded weeds such as smallflower umbrella sedge, redstem, and ricefield bulrush, the fallow period will likely have no effect. A good anecdotal example is from a field in Davis that was planted for a long time in rice, followed by nothing being planted for over 10 years. Once the field went back into rice, ricefield bulrush was...
- Author: Bradley Hanson
- Author: Trina Kleist
(excerpted from an obituary prepared by Trina Kleist from the UC Davis Department of Plant Sciences)
Albert Fischer, a professor emeritus of weed ecophysiology in the UC Davis Department of Plant Sciences, was recently named recipient of the Outstanding International Achievement Award by the International Weed Science Society.
Shortly after the award was announced, Fischer passed away on Nov. 22 in Davis, Calif. He was 72. Former student Whitney Brim-DeForest accepted the award on Fischer's behalf at the society's quadrennial meeting Dec. 8 in...