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Monsanto faces challenges in battle against weeds

By Dan Charles, NPR

Washington, DC – In the age-old struggle between farmers and weeds, farmers have enjoyed the weed killer Roundup. Some have called it the herbicide of a lifetime.

But after 30 years on the market the chemical seems to be losing its power over some weeds, changing farming practices nationwide.

It also means more work for St. Louis-based Monsanto.

NPR's Dan Charles prepared this report for Morning Edition. To hear it, click here.