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At David Wildy's soybean fields in Arkansas, soybean plants planted in April 2017 (left) show signs of being impacted by dicamba. Soybean plants planted later in the season (right) stand taller. The Washington Post / Getty Images

The U.S. Environmental Protection Agency (EPA) announced Wednesday that it would allow farmers to continue spraying the controversial pesticide dicamba for the next two years. Dicamba is sold by Monsanto to be used on soybean and cotton plants genetically engineered to be resistant to the weedkiller. The problem is that it drifts on the wind, harming non-resistant crops and wild plants. Over the past two years, it damaged around five million acres of crops, trees and gardens, the Center for Biological Diversity (CBD) said.

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Wine makers in West Texas are reeling from herbicide drift injuries on their grapevines, an emerging threat to the state's $13 billion a year industry, NPR's Morning Edition reported Tuesday.

The damage likely originates from use of Monsanto's dicamba and Dow's 2,4-D formulations on nearby cotton fields. The companies sell cotton seeds that are genetically modified to withstand applications of the weedkillers. If farmers use the products improperly, the highly volatile chemicals can get picked up by the wind and land on off-target crops. When exposed to the herbicides, the leaves on non-target plants are often left cupped and distorted.

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Significant cupping of leaves from dicamba drift on non-Xtend soybeans planted next to Xtend beans in research plots at the Ashland Bottoms farm near Manhattan, KS. Dallas Peterson, K-State Research and Extension / CC BY 2.0

Two of the nation's largest independent seed sellers, Beck's Hybrids and Stine Seed, are urging the U.S. Environmental Protection Agency (EPA) to place limits on the spraying of the drift-prone pesticide dicamba, Reuters reported.

This could potentially hurt Monsanto, which along with DowDupont and BASF SE, makes dicamba formulations to use on Monsanto's Xtend seeds that are genetically engineered to resist applications of the weedkiller. Beck's Hybrids and Stine Seed, as well as other companies, sell those seeds.

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Brian Smith and his cousin Hughes, both fifth generation soybean farmers in Mississippi County, Arkansas, stand in soybean fields their family tend to that show signs of having been affected by dicamba use in August, 2017. Getty Images

A University of Missouri report released Thursday estimates that drift damage from the pesticide dicamba has occurred across 1.1 million acres of agricultural crops, trees and other plants so far this year.

This comes less than a year after the U.S. Environmental Protection Agency (EPA) and many states introduced additional restrictions meant to prevent off-target damage from the pesticide. Last year dicamba drift wreaked havoc on a reported 3.6 million acres of soybean crops not genetically engineered to resist the notoriously drift-prone pesticide.

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Soybeans with cupped leaves, a symptom of dicamba injury. University of Arkansas System Division of Agriculture / Flickr / CC BY-NC 2.0

University weed scientists have reported roughly 383,000 acres of soybean injured by a weedkiller called dicamba so far in 2018, according to University of Missouri plant sciences professor, Kevin Bradley.

Dicamba destroys mostly everything in its path except the crops that are genetically engineered (GE) to resist it. The drift-prone chemical can be picked up by the wind and land on neighboring non-target fields. Plants exposed to the chemical are left wrinkled, cupped or stunted in growth.

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In 2016 Klamath Basin National Wildlife Refuge Complex in California and Oregon was sprayed with 236,966 pounds of pesticides. Michael (a.k.a. moik) McCullough / Flickr / CC BY 2.0

America's national wildlife refuges are being doused with hundreds of thousands of pounds of dangerous agricultural pesticides every year, according to a first-of-its-kind analysis by the Center for Biological Diversity.

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