Herbicide resistance can be a big problem. But the good news is that managing herbicide resistance has never been easier. Learn five key management strategies that could make improvements on your farm, plus learn more about the
importance of crop rotation and why knowing your herbicide’s mode of action is key.

Herbicide Groups

In 1997, herbicides were organized into groups, based on their mode of action (the way they kill a weed). Many groups, such as Group 1, contain several herbicides. Some of these have identical modes of action; others have a mode of action that is similar to others in the group. Some groups have only a few products, and there are groups with only one herbicide because it has a unique mode of action. There are presently 28 herbicide groups.


In recent years, scientists and crop specialists have found weeds that are resistant to more than one mode of action. Some of these weeds are resistant to all of the modes of action within a particular group (cross-resistance) while other weeds are resistant to modes of action in different groups (multiple resistance).


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