- Author: Whitney Brim-DeForest
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: Amber Vinchesi-Vahl
Sutter County grows between 300 and 800 acres of fresh-market honeydew, mixed melon and cantaloupe each year. The fields vary between furrow and drip irrigation, with many fields in the Sutter Basin only receiving a pre-irrigation.
Because of the rapid growth of melons, they are competitive with weeds and one cultivation may be sufficient to control weed issues. The growing habits of melons reduce the need for herbicides, which is fortunate since the availability of registered and effective herbicides is limited.
Generally, in Sutter County, the field is tilled, pre-irrigated, worked again, and melons are planted into moisture. When weed pressure is high, a hand-hoeing crew comes in and cultivates. Since many of...
In a previous article we gave a general background of branched broomrape (Phelipanche ramosa), a parasitic weed which was the focus of a $1.5 million eradication effort four decades ago in California, and now a re-emerging threat to California processing tomato (
Richard Smith is the UC Cooperative Extension Vegetable Crop Production and Weed Science Farm Advisor in Monterey, Santa Cruz and San Benito counties.
Automated weeders remove weeds inside the three- to five-inch-wide uncultivated band left around the seedline by standard cultivation. Automated weeder technology has improved significantly over the past decade. All automated weeders use 1) cameras to detect plants, 2) a computer to process the image and make decisions about which plants to keep and which to remove and 3) a kill mechanism. Kill mechanism that operates in the seedline used by currently available machines are either a split blade that opens around keeper...
- Posted by: Gale Perez
Join UC Cooperative Extension for a FREE online workshop.
EVENT NAME: Weed Management for Small Acreages workshop
DAY/DATE: Tuesday, May 25, 2021
TIME: 6:00-7:30 PM (Pacific Time)
- Common Weeds in Irrigated Pastures and on Rangelands • Julie Finzel, UCCE Kern, Tulare, and Kings Counties
- Online and App-based Weed ID and Management Tools •...