KEY POINTS

images   Herbicide resistance is not a new problem.

images   Globally, resistance has evolved for all herbicide mechanisms of action.

images   The rate of resistance evolution has accelerated; more farmers rely on single herbicides to control weeds.

images   Herbicide resistance is not an herbicide or genetic-engineering problem but a behavioral problem.

images

Waterhemp (Amaranthus tuberculatus syn. rudis), courtesy of the U.S. Department of Agriculture, Agricultural Research Service.



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