Herbicides have been a backbone of agriculture since the 1960s and still play an important part in successful no-till systems. But herbicide resistance has become a major threat to farm production. New resistance problems are appearing more quickly than before and are largely being driven by a different resistance mechanism in the plants, says Bob Hartzler.

The weed specialist at Iowa State University Extension will explain “rapid herbicide metabolism” in weeds and how it’s allowing weeds to develop resistance to herbicides more quickly. And he’ll provide an overview of why metabolism-based resistance requires a different approach to managing this problem and what no-tillers can do to preserve their herbicide program for the future.