Standard, recommended wheat harvest protocol in the United States is to drench the wheat fields with Roundup several days before the combine harvesters work through the fields as withered, dead wheat plants are less taxing on the farm equipment and easier to harvest than live ones.
Pre-harvest application of Roundup and other herbicides containing the deadly active ingredient glyphosate to wheat and barley as a desiccant was suggested as early as 1980. It has since become routine and is used as a drying agent 7-10 days before harvest within the conventional farming community.
According to the US Department of Agriculture, as of 2012, 99% of durum wheat, 97% of spring wheat, and 61% of winter wheat has been doused with Roundup as part of the harvesting process. This is an increase from 88% for durum wheat, 91% for spring wheat and 47% for winter wheat since 1998.