"American farmers¹ broad use of the weedkiller glyphosphate ? particularly Roundup, which was originally made by Monsanto ? has led to the rapid growth in recent years of herbicide-resistant weeds. To fight them, farmers are being forced to spray fields with more toxic herbicides, pull weeds by hand and return to more labor-intensive methods like regular plowing.
What should farmers do about these superweeds? What does the problem mean for agriculture in the U.S.? Will it temper American agriculture¹s enthusiasm for genetically modified crops that are engineered to survive spraying with Roundup?"
Graphic: Where Weedkiller Won¹t Work below