"Weed-Killer Roundup Has Made Weeds Harder To Kill"

"Over-reliance on the popular weed-killer Roundup has sped the evolution of weed species resistant to the herbicide, forcing some farmers to return to costlier and less environmentally-friendly methods of controlling crop-destructive infestations.

For 14 years, the calculus of Roundup has been simple: Apply it and pesky weeds die while genetically modified “Roundup Ready” crops live. Farmers stopped using older, harsher herbicides and the heavy field tillage that leads to soil erosion and the runoff of sediments and chemicals into rivers and streams.

Spending less time in the field, they have saved on labor and fuel costs."

Tom Beyerlein reports for the Dayton Daily News June 7, 2010.