http://www.allgov.com/news/controversies/monsanto-chemical-resistant-weed-strikes-southern-cotton-fields-and-threatens-midwest-140813?news=853956
Case study: Palmer amaranth
" It started showing up in cotton fields in the South, and before farmers
knew it, it was everywhere. It can grow higher than six feet tall and
spread a million seeds from each plant. Roundup was useless against it,
leaving farmers the choice of pulling the weed by hand or using more
powerful herbicides that could kill crops as well."
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