Green Quiz: Superweeds

Photo: Global Water Partnership


When Monsanto introduced pesticide resistant seeds ("Roundup Ready") in the 1990s, farmers weren't prepared for the growth in "superweeds" that also developed resistance to the pesticide. Now, superweeds are pervasive on American farms. How many acres of farmland have superweeds invaded in the US?

A) 5 million acres

B) 25 million acres

C) 48 million acres

D) 60 million acres


The correct answer is D) 60 million acres. According to the Union of Concerned Scientists, weed species began evolving resistance to glyphosate, the active ingredient in Roundup, in the United States within five years of introduction. Fifty percent of U.S. farmers surveyed report glyphosate-resistant weed infestations. In the Southeast, more than 90 percent of cotton and soybean farmers are affected.  


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