Role of absorption and translocation in the mechanism of glyphosate resistance in horseweed (Conyza canadensis)

Abstract
21 ) killed S plants but not R plants (38 to 58% control) regardless of state origin. These results suggest that a simple bioassay can be used to screen biotypes for suspected resistance and that reduced translocation of glyphosate plays a major role in glyphosate resis- tance in R biotypes of horseweed.