An herbicide so hazardous that courts have banned it twice

In early February, something rather extraordinary happened in the world of American farming. For the second time, a federal court banned the hazardous herbicide dicamba, which has been wreaking havoc on farmers, rural communities and the natural world for seven long years. The Environmental Protection Agency (EPA) re-approved dicamba after the first court action. Will it do so once again?

What about dicamba makes it so hazardous that courts have overruled EPA twice? It’s an incredibly volatile, drift-prone weed-killer, and extremely potent as well: just one teaspoon over an acre stunts tomato plants. It vaporizes while being sprayed, but also evaporates from plant surfaces and soil days after a spraying operation. Once the vapor is airborne, it forms clouds that drift long distances to kill or injure virtually any flowering plant in its path.

And that’s precisely what happened following Monsanto’s 2016 introduction of soybeans and cotton genetically engineered (GE) to withstand dicamba’s killing effects. Widespread planting of these new GE crops triggered a dramatic upsurge in use during late spring and summer, when heat enhances dicamba’s volatility.

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