April 14, 2010 11:01 AM

Overuse of genetically-modify crops may lead to tougher weeds

Ask Don Garlow about his days "walking beans" and the Concordia, Kan., farmer's back almost aches in memory. It used to be the only practical way to rescue a soybean field from weeds was by walking the rows and yanking the invaders by hand. Now, in testimony to the wonders of biotechnology, the same fields are pictures of uniformity.

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