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Pengyin Chen, professor of soybean breeding and genetics at the University of Missouri, in his test plots of soybeans near the town of Portageville. Dan Charles/NPR hide caption

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Rogue Weedkiller Vapors Are Threatening Soybean Science

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These Palmer amaranth — or pigweed — plants, seen growing in a greenhouse at Kansas State University, appear to be resistant to multiple herbicides. Dan Charles/NPR hide caption

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As Weeds Outsmart The Latest Weedkillers, Farmers Are Running Out Of Easy Options

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Brent Henderson harvests soybeans on his farm near Weona, Ark., in 2017. That crop showed symptoms of dicamba exposure. Henderson switched to Xtend soybeans the following year, he says, as "insurance" against future damage. Dan Charles/NPR hide caption

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Is Fear Driving Sales Of Monsanto's Dicamba-Proof Soybeans?

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These soybeans were damaged in 2017 by dicamba, a popular weedkiller that's prone to drifting into neighboring fields. Some farmers in the state are defying efforts by regulators to strictly limit use of the chemical. Dan Charles/NPR hide caption

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Despite A Ban, Arkansas Farmers Are Still Spraying Controversial Weedkiller

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The edges of this sycamore leaf are turned upward into a cuplike shape, the typical sign of exposure to dicamba. Dan Charles/NPR hide caption

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A Drifting Weedkiller Puts Prized Trees At Risk

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Arkansas farmer David Wildy inspects a field of soybeans that were damaged by dicamba. The pesticide ban is tied up in courts, leaving farmers uncertain about what to plant. Dan Charles/NPR hide caption

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Ray Vester served on the Arkansas State Plant Board for 18 years. "It's self-governing, by the people, for the people," he says. Dan Charles/NPR hide caption

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These Citizen-Regulators In Arkansas Defied Monsanto. Now They're Under Attack

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Bob Scott, a weed scientist at the University of Arkansas, says he wishes more testing could have been done on the new dicamba formulations, but "the product was not made available to us." Dan Charles/ NPR hide caption

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Monsanto Attacks Scientists After Studies Show Trouble For Weedkiller Dicamba

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Brent Henderson harvests soybeans on his farm near Weona, Ark. "If it's going to be legal to use and neighbors are planting it, I'm going to have to plant [dicamba-tolerant soybeans] to protect myself," he says. "It's very annoying. ... My neighbor should not dictate what I do on my farm." Dan Charles/NPR hide caption

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Damage to soybean plants and other crops has led to arguments and strain between neighbors. Dan Charles/NPR hide caption

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A Wayward Weedkiller Divides Farm Communities, Harms Wildlife

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A sprayer covers a soybean field with an herbicide to control weeds. Scott Sinklier/Getty Images hide caption

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Damage From Wayward Weedkiller Keeps Growing

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