After Monsanto introduced Roundup Ready corn and soybeans in the mid-1990s, the use of glyphosate skyrocketed.

Currently, more than 90 percent of fields grow crops that won’t die or face damage from glyphosate, and the herbicide is the most widely used in the country.

But “superweeds,” like Palmer amaranth, developed a resistance to glyphosate – the key ingredient in Roundup – after years of overuse. For more, please click here.