Superweeds Threaten U.S. Farms

In the last couple of decades, chemicals and genetics have radically changed much of American farming. Monsanto’s “Round-up” killed every weed in the field, and left Round-up-impervious, genetically-modified crops to thrive. Plowing, tilling – unnecessary. Crop rotation – optional. But nature and evolution did not go away. Now, a new generation of weeds – “superweeds” – has evolved. Round-up doesn’t kill them. Some fierce old chemicals are being dusted off. And old tilling, too.

Very detailed WSJ article on "superweeds" here.
Fascinating discussion with Tom Ashbrook, On Point here, or listen directly here .