Dicamba-Resistant Pigweed Field Trial Announced

University of Arkansas System Division of Agriculture researchers have selected dicamba-resistant pigweed to document how genetic resistance develops and how the industry must work to protect the few remaining weed-fighting options, according to a recent ArkansasOnline.com post.

Bob Scott, an extension weed scientist, emphasized that the finding was the result of controlled greenhouse studies and not a confirmation of anything found in any field.

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“Through experimentation in the greenhouse, we selected a population of pigweed that is tolerant to the herbicide dicamba at a field rate,” Scott said. “This pigweed population was not found to be resistant to dicamba in nature or in any field.”

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Scott’s colleagues, Jason Norsworthy, division weed scientist; Parsa Tehranchian, Norsworthy’s post-doctoral associate; and Stephen Powles, professor of plant biology at the University of Western Australia, designed the greenhouse experiment to examine the potential for the future of resistance.

The researchers began with dicamba-susceptible pigweed collected from the field. The researchers exposed three generations of pigweed to sublethal doses of dicamba, “which, of course, is a recipe for resistance development,” Scott said.

Head on over to ArkansasOnline.com to check out the full story.

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