Farmers and weeds are in a constant competition.
But with Monsanto’s introduction of Roundup herbicide and genetically engineered Roundup Ready crops in the mid-1990s, farmers gained a clear edge. The seeds, which were able to tolerate the herbicide, were adopted quickly. By 2011, more than 90 percent of soybeans and cotton, and more than 70 percent of corn were planted with Roundup Ready seeds.
