This slides illustrates the increase in the number of herbicide resistant weed biotypes by herbicide family. The two herbicide families with the most resistant biotypes are the triazines and the ALS-inhibitors. This is due to the fact that the triazine herbicides have been used for more than 46 years while the ALS herbicides have single sites of action and are among the most popular herbicides used today.

Herbicide Resistant Weeds By Mode of Action<BR>