Weed research looks at Provisa technology

Frances Gould, Schultz, Bruce  |  1/24/2017 8:48:05 PM

Much of AgCenter weed scientist Eric Webster’s work in 2016 involved studies of the quizalofop herbicide to be used with Provisia rice technology.

“We had several trials that were tank mixes,” Webster said.

He tested combinations of quizalofop with broadleaf and aquatic herbicides.

The work has shown that 2,4-D, propanil, Grandstand, Regiment and Grasp are not good candidates for mixing with quizalofop. “A lot of times, the broadleaf herbicides antagonize the grass herbicides,” he said.

But Permit, Basagran and Londax are not as antagonistic with quizalofop.

Webster said he saw an increase in fields last year with outcrosses and bad red rice problems that would have benefitted from Provisia.

“It’s going to allow us to control those weedy rices,” he said. “It’s something that’s really going to help us.”

Webster’s work is showing that rotating Provisia rice with Roundup Ready soybeans will get a problem field under control.

“It takes at least a three-year rotation to get out of that weedy rice,” he said.

During 2016, Webster received several calls about Brooks paspalum and Nealley’s sprangletop. In addition, water primrose was more of a problem, and more farmers had problems with aquatic weeds such as ducksalad because of the increase in water-seeded rice.

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