Posts Tagged: herbicide resistance

Italian ryegrass update: latest research and management strategy

In California, Italian ryegrass [Lolium perenne L. spp. multiflorum (Lam.) Husnot] has been around for a long time and is a major weed in orchards, vineyards, field crops, fallow fields, and so on. It grows vigorously in winter and early spring. Italian ryegrass is a short, rhizomatous, that grows...

Webinar on herbicide-resistant annual bluegrass (USDA Office of Pest Management Policy). May 23, 2023.

Sharing a link to an upcoming seminar on a broad screening of annual bluegrass (Poaannua) resistance to herbicides.  This is related to aUSDA Specialty Crop Research Initiative grant called "ResistPoa".   From Weed Science Society of America press release: Annual bluegrass (Poa...

Herbicide Susceptibility Survey of Watergrass (Echinochloa spp.) in California Rice

From the CAPCA Adviser magazine :: June 2022 Whitney Brim-DeForest is a UCCE Rice and Wild Rice Advisor for Sutter, Yuba, Sacramento, and Placer Counties; Taiyu Guan is an Assistant Specialist in UCCE Sutter-Yuba Counties; Troy Clark is a Rice Junior Specialist for UCCE Butte...

Determining the herbicide-resistance in grower fields is a key for successful weed control in rice

From the Rice Notes April 2022 newsletter Kassim Al-Khatib is the Melvin D. Androus Endowed Professor for Weed Science at UC Davis and a Cooperative Extension Weed Science Specialist.   Herbicide resistance is a serious problem in California rice. However, not every control failure can be...

Poor control of common chickweed with ALS-inhibitor herbicides reported in multiple small grain fields in the southern San Joaquin Valley. Is it a new case of herbicide resistance in California?

Common chickweed (Stellaria media) (Figure 1) is a winter annual found throughout California and considered to be one of the most common broadleaf weeds infesting cereal crops (also referred as small grains) in the state (Wilen 2006). Herbicides can provide effective control of chickweed; however,...

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