Wednesday, November 12, 2025

weedy rice

Clean fields

Extremely grassy season put the new Provisia Rice System to the test • By Vicky Boyd, Editor • Growers with resistant weedy rice who planted the first commercial Provisia rice variety in 2018 say the decision was a “no-brainer,” even though they...

UC farm advisers ID new weedy rice biotype in a field

This season, University of California Cooperative Extension rice farm advisers were contacted by several growers and pest control advisers to inspect plants suspected to be weedy rice. When the identification was difficult, farm advisers grew them in the greenhouse to determine...

Is it weedy rice or an imposter? UC has some answers

Rice is beginning to head in the California rice-production area. As you scout your fields, keep weedy rice in mind. In the past few weeks, University of California Cooperative Extension farm advisers have received 10 suspect samples. Of these, two...

Time for California growers to start scouting for weedy rice

Now that clean-up herbicide applications are finishing, it is a good time to start thinking about weedy rice. If your field has a history of weedy rice, start scouting for watergrass-looking weeds. Check patches of surviving grass. If the plants...

The hunt is on

Weedy rice control remains elusive for California growers, but researchers continue to search for potential herbicides. By Vicky Boyd Editor Whitney Brim-DeForest displayed the five different biotypes of weedy rice found in California at the Rice Experiment Station's annual Rice Field Day. The California...

Consider variety selection carefully, use certified seed

In California, most farmers grow medium-grain varieties. The commercially available medium Calrose rice varieties have been selected to meet the high quality and yield standards for California.  Varietal selection is one of the first and most important decisions a rice...

Got weedy rice? There’s an app for that

Got weedy rice? There's an app for that, thanks to the University of California's Cooperative Extension. Rice producers and pest control advisers in California who suspect they may be seeing weedy rice in a field can report it using a...

Horizon Ag, BASF ink pact to launch Provisia Rice System in 2018

Horizon Ag and BASF have reached a formal agreement to launch the Provisia Rice System in 2018, providing a new tool for post-emergence control of a broad range of grasses, including weedy rice. Like the Clearfield Production System for rice,...

‘Red alert’

Weedy rice expansion in California raises concern, prompting calls for using only certified seed and an industry-wide scouting effort. By Vicky Boyd Editor A weedy rice infestation exploded in California from a handful of confirmed fields in prior years to covering more than 10,000 acres in 2016,...

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