Herbicide resistance can be defined as the acquired ability of a weed population to survive a herbicide application that previously was known to control the population. In this case ‘acquired’ refers to the fact that resistance evolves in relationship to how a herbicide is used over time in a weed management system.

This lesson presents an introduction to the fundamentals of herbicide resistances. By the end of this lesson, you will: 

• Understand what herbicide resistance is and how it evolves in the field.

• Recognize the factors that influence selection for herbicide resistance.

• Define the different types of herbicide resistance.

Successful completion of this module will earn you 1 recertification credit for New York State DEC certified pesticide applicators in categories 1a,9,10,21,22,23,24,25,2,3a,3b,5a,6a

*If you are certified in one of these states: Maryland, Massachusetts, Pennsylvania, Rhode Island, or West Virginia, you can check the state specific information page to confirm approval and recertification credit value.

*Vermont, Maine, New Hampshire, and Connecticut have approved all DLC courses and awards the same credits as New York.