In this June 1, 2010 photo, central Illinois corn farmer Jerry McCulley sprays the weed killer glyphosate across his cornfield in Auburn, Ill. A handful of hardy weeds have adapted to survive glyphosate _ sold as Roundup and a variety of other brands _ which many scientists say threatens to make the ubiquitous herbicide far less useful to farmers. (AP Photo/Seth Perlman)

Use Information This content is intended for editorial use only.
For other uses, additional clearances may be required.