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Superweeds pose environmental threat

Published: July 2, 2010
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David Mercer AP Writer Champaign, IL — When the weed killer Roundup was introduced in the 1970s, it proved it could kill nearly any plant while still being safer than many other herbicides, and it allowed farmers to give up harsher chemicals and reduce tilling that can contribute to erosion. But 34 years later, a [...]