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Study shows importance of residual herbicide

Agriculture.com Staff 06/22/2007 @ 2:20am

Use of residual herbicides in Roundup Ready cropping systems improves control of tough weeds such as lambsquarters, pigweed and wild buckwheat and reduces the potential for development of weed resistance, according to a recent company study.

The weed resistance study was conducted at irrigated and non-irrigated sites across Nebraska, Colorado, Kansas and Wyoming. This research encompassed a continual rotation of Roundup Ready crop technologies in corn, soybeans, sugarbeets and spring wheat.

The purpose of the study was to create an environment of continuous Roundup Ready crops to determine if, when and how weed resistance to glyphosate might develop over time. After nine years of continuous use of full rates of Roundup agricultural herbicides, there was a shift in weed population to common lambsquarters.

However, where a residual herbicide was used at planting in conjunction with Roundup herbicides applied over the top in Roundup Ready Corn, lambsquarters was again controlled, according to Robert Wilson, a weed scientist at the University of Nebraska and an academic principle in the study.

When the study was initiated, Roundup Ready Corn was used until Roundup Ready Corn 2 was developed, then the latter technology was used. The study looked at different rotation combinations of the four Roundup Ready crops.

"We've established that you get better weed control with glyphosate when a preemergence herbicide is applied," Wilson says. "After the residual treatment, the weeds are smaller and more susceptible to control with glyphosate, and there are fewer weeds to contend with."

Use of residual herbicides in Roundup Ready cropping systems improves control of tough weeds such as lambsquarters, pigweed and wild buckwheat and reduces the potential for development of weed resistance, according to a recent company study.

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