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As weeds outsmart the latest weedkillers, farmers are running out of easy options

April 15th, 2019 / The Salt

There was a moment, about 20 years ago, when farmers thought that they’d finally defeated weeds forever.

Biotech companies had given them a new weapon: genetically engineered crops that could tolerate doses of the herbicide glyphosate, also known by its trade name, Roundup. Farmers could spray this chemical right over their …