Glyphosate-resistant Palmer amaranth has been economically devastating to row-crop producers in southern United States. The threat of glyphosate-resistant weeds, especially a devastating weed like Palmer amaranth, has a substantial impact on Michigan soybean growers. Glyphosate-resistant weeds impact growers economically and emotionally. For example, management of glyphosate-resistant weeds increase weed control costs substantially. They also effect the long-term management of a particular field. In areas in the south where glyphosate-resistant Palmer amaranth is wide-spread land values have decreased and many times hand labor is needed to manage this weed.