- Author: Whitney Brim-DeForest
Watergrass
We are having more and more difficulties controlling watergrass over the past 20 or so years. We know that as of the early 2000s, we had found multiple-herbicide resistant late watergrass (also known as mimic), as well as multiple-herbicide resistant barnyardgrass. For early watergrass, we now have resistant biotypes (to thiobencarb), with none recorded as being multiple-herbicide resistant.
In 2017, two rice fields were identified with an unknown watergrass biotype (or species) that looked very different than the three main known species that infest California rice fields (late watergrass, early watergrass, and barnyardgrass). Both fields had...
- Author: Michelle Leinfelder-Miles
- Posted by: Gale Perez
From the San Joaquin Valley Delta Field Crops blog • Jan. 21, 2021
Michelle Leinfelder-Miles is the UC Cooperative Extension Delta Crops Resource Management Advisor serving San Joaquin, Sacramento, Yolo, Solano, and Contra Costa counties.
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Herbicide Trial in Delta Drill-Seeded Rice - 2020
Weeds are important pests of California...
- Posted by: Gale Perez
Mark your calendar...
UC COOPERATIVE EXTENSION presents
2021 Rice Growers Meeting
When: February 11, 2021|9:00 AM-12:00 PM
Where: Virtual via Zoom
Cost: $10
/h2>- Author: Whitney Brim-DeForest
In 2017, I started getting reports of a watergrass biotype/species (Echinochloa spp.) that was difficult to control using our suite of herbicides registered in rice. At the time, I knew we had multiple herbicide-resistance in late watergrass (Echinochloa phyllopogon), so I initially just thought the resistant biotype was spreading, and had maybe gained resistance to additional herbicide modes of action. However, once I started visiting fields, it quickly became apparent that this was not late watergrass (phenotypically-speaking). It also did not appear to be barnyardgrass (Echinochloa crus-galli), although the Echinochloa species are notoriously difficult to identify, and phenotypically quite variable in...
- Posted by: Gale Perez
If you missed this year's California Rice VIRTUAL Field Day, you can view it here.
California Rice Virtual Field Day
The full recording can be viewed here.
HIGHLIGHTED weed science presentations:
- 0:20:59 • Florpyrauxifen-benzyl (Loyant): A New Herbicide for California Rice • Kassim Al-Khatib, CE Specialist, Dept. of Plant Sciences, UC Davis
- 0:37:37 • Weedy Rice Trials and Herbicide Failures in the Field •...