BILL BARKSDALE / AGSTOCKUSA / SCIENCE PHOTO LIBRARY BILL BARKSDALE / AGSTOCKUSA / SCIENCE PHOTO LIBRARY
Herbicide resistant marestail weeds amongst cotton stubble. The marestail plant (Conyza canadensis) on the right has been killed by glyphosate Roundup herbicide. The plant on the left has survived indicating a degree of resistance to the roundup. Photographed in Tennessee, USA.
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