Knowing mechanisms and groups of herbicide is important in order to manage resistance. Herbicide resistance is the inherent ability of a weed to survive a herbicide rate that would normally control it. This is not the same phenomena as poor herbicide performance. If herbicide resistance develops, other herbicides or different control methods will have to be used to control a weed. These options may be more expensive or less effective.

Once developed, herbicide resistance will persist for many years.

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