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Food And Farm Beast Of A Weed

In this Aug. 16, 2013 photo provided by Iowa State University, graduate student Meaghan Bryan stands near a Palmer amaranth plant found in a farm field near Modale, Iowa. Midwestern seed scientists are sounding the alarm about Palmer amaranth, a scourge of the South that is now moving north. The weed can shoot up as high as 7 feet, scatter a million seeds from a single plant, is tough to clear by hand and is increasingly resistant to herbicides. (AP Photo/Iowa State University, Bob Hartzler)